04-11-2018, 01:13 PM
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#1
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 993
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Cat bypass with resonator
I was seraching ebay for the cicuit werks bypass pipes, and found they also offer a bypass pipe with resonators. Looks like a cat but is a fesonator, was curious what that supposed to do? Does it change the sound, or is it more affective?
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2000 Boxster S Ocean Blue Metalic
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04-11-2018, 01:42 PM
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#2
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550 Anniversary
Join Date: Jul 2012
Location: Surrey, UK
Posts: 747
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In Europe these sections are the cats. I guess it's easy to make from the same tooling but simply not put the cat core inside. Stick some snazzy marketing words in the advert and hey presto a new product line.
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04-11-2018, 02:09 PM
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#3
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Registered User
Join Date: Oct 2011
Location: SoCal
Posts: 66
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Resonator changes the frequency of the sound - Less drone sound. Mufflers makes the car quiet.
I just have resonators on my autox Boxster after the precats and no mufflers at all. My complete exhaust weights just 17lbs including the test pipe section and resonators. It is loud, but not super loud like an uncorked car. I could not daily drive the Boxster due to the heavy drone. Driving the car to the track or autox is bearable since I only do it once or twice a month.
Before my current setup, I had the eBay bypass pipes with no resonators and the eBay muffler. No drone what so ever. I was quite surprised. The only bad thing about the Chinese ebay exhaust stuff is the fit. I had to fab mine a little and make a custom mount to make it fit perfectly. I might be a little picky too....
Last edited by SoloPierre; 04-11-2018 at 02:17 PM.
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04-11-2018, 08:19 PM
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#4
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 993
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Quote:
Originally Posted by SoloPierre
Resonator changes the frequency of the sound - Less drone sound. Mufflers makes the car quiet.
I just have resonators on my autox Boxster after the precats and no mufflers at all. My complete exhaust weights just 17lbs including the test pipe section and resonators. It is loud, but not super loud like an uncorked car. I could not daily drive the Boxster due to the heavy drone. Driving the car to the track or autox is bearable since I only do it once or twice a month.
Before my current setup, I had the eBay bypass pipes with no resonators and the eBay muffler. No drone what so ever. I was quite surprised. The only bad thing about the Chinese ebay exhaust stuff is the fit. I had to fab mine a little and make a custom mount to make it fit perfectly. I might be a little picky too....
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Thanks for the replies. Theses are cat bypass with resonator, so I think they are intended to be used with the muffer in place. Just have not seen these before in this way.
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2000 Boxster S Ocean Blue Metalic
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04-11-2018, 05:02 PM
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#5
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Registered User
Join Date: Jul 2005
Location: MA
Posts: 882
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I don’t think these cut down on sound as much as they ‘look’ like cats so you can pass the visual emissions check in states that inspect the exhaust.
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98 Arena Red 986
Last edited by Stroked & Blown; 04-14-2022 at 06:18 AM.
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04-12-2018, 11:46 AM
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#6
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Registered User
Join Date: Oct 2011
Location: SoCal
Posts: 66
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If you are running a muffler that is known to drone, you might consider the test pipes with resonators. I ran the the cheap eBay test pipes (no resonators) and eBay muffler, and I had no droning what do ever. If you running a stock muf, skip the resonators. If you are running something like a GLH muffler that is known to drone, I would consider the test pipes with the resonators.
Last edited by SoloPierre; 04-12-2018 at 11:48 AM.
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04-18-2018, 03:35 PM
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#7
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2000 Boxster S
Join Date: Mar 2017
Location: Woodside, Ca
Posts: 18
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I live in California and just bought the Top Speed "test" pipes. Called the well respected exhaust shop in the area and he said he cant install them, its illegal to remove even the secondary cats.
There is no way I can burn the existing rusted bolts off without professional help (in more ways than one, ha!)
Any tricks you all could share?
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04-18-2018, 08:49 PM
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#8
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 993
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Quote:
Originally Posted by Booker42
I live in California and just bought the Top Speed "test" pipes. Called the well respected exhaust shop in the area and he said he cant install them, its illegal to remove even the secondary cats.
There is no way I can burn the existing rusted bolts off without professional help (in more ways than one, ha!)
Any tricks you all could share?
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Yeah illegal in cali for sure. Probably wont work but you could try soaking them with wd40 or some type of penetration lube let it sit for a couple of hours, see if that would work.
Look for a not so respectable shop, to cut the bolts for you.
Tell them you need you are installing because you will be tracking the car, so you will be switching in and out. I am sure thats belevable.
Myself have not had them installed, so good luck.
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2000 Boxster S Ocean Blue Metalic
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04-18-2018, 10:10 PM
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#9
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Registered User
Join Date: Apr 2011
Location: Alabama
Posts: 487
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Seems I recall the bolts at the triangular plate are splined at the base and pressed in, so inspect yours and if this applies, turn the nut not the bolt.
Pretty sure I replaced with normal non-splined bolts. Was a while back.
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04-10-2022, 01:45 PM
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#10
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Registered User
Join Date: Sep 2018
Location: Laval QC
Posts: 813
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Quote:
Originally Posted by BrokenLinkage
Seems I recall the bolts at the triangular plate are splined at the base and pressed in, so inspect yours and if this applies, turn the nut not the bolt.
Pretty sure I replaced with normal non-splined bolts. Was a while back.
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You are right about the splined bolts. They can be cut off with a Sawzall or hacksaw if you have lots of time. When I do muffler work I only take the saw under the car with me... I replaced with stainless steel bolts and nuts.
__________________
Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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04-19-2018, 06:37 AM
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#11
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Quote:
Originally Posted by Booker42
I live in California and just bought the Top Speed "test" pipes. Called the well respected exhaust shop in the area and he said he cant install them, its illegal to remove even the secondary cats.
There is no way I can burn the existing rusted bolts off without professional help (in more ways than one, ha!)
Any tricks you all could share?
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Try a welding shop. They can cut off the old bolts in about 2 mins and they usually could care less about what you're doing to your car or why.
Everything after that is a fairly easy DIY.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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04-19-2018, 08:37 AM
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#12
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2000 Boxster S
Join Date: Mar 2017
Location: Woodside, Ca
Posts: 18
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Thanks all, good advice!
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04-19-2018, 08:40 AM
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#13
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,955
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Quote:
Originally Posted by thstone
Try a welding shop. They can cut off the old bolts in about 2 mins and they usually could care less about what you're doing to your car or why.
Everything after that is a fairly easy DIY.
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You also should be able to cut them off with a Dremel...
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04-19-2018, 09:48 AM
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#14
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01101
Join Date: Jul 2015
Location: CT
Posts: 587
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You could just pay them to remove and replace the bolts with fresh ones. Then carry on DIY replacement of the secondary cats.
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04-19-2018, 01:01 PM
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#15
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 993
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Quote:
Originally Posted by alm001
You could just pay them to remove and replace the bolts with fresh ones. Then carry on DIY replacement of the secondary cats.
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That is a damn good idea, simple and to the point. Lol
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2000 Boxster S Ocean Blue Metalic
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04-23-2018, 08:42 AM
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#16
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2000 Boxster S
Join Date: Mar 2017
Location: Woodside, Ca
Posts: 18
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Success, used Gilles Dremel idea for the bottom two bolts and used brute force to break the top bolt with a 13mm socket and a breaker bar. After that, the job was easy. After reading several post on the subject, I got the 2" Easy Clamps and they worked great.
Thanks again to all for the help!
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04-25-2018, 05:33 PM
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#17
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Racer Boy
Join Date: Sep 2015
Location: Seattle, WA
Posts: 946
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Quote:
Originally Posted by Booker42
Success, used Gilles Dremel idea for the bottom two bolts and used brute force to break the top bolt with a 13mm socket and a breaker bar. After that, the job was easy. After reading several post on the subject, I got the 2" Easy Clamps and they worked great.
Thanks again to all for the help!
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I just installed the non-resonator Circuit Werks pipes, and the passenger side stock pipe was a nightmare to get out. I too ended up cutting the clamps to get it apart. However the 2" Easy Clamp was too large and didn't work. How did you get yours to fit? I ended up getting the stock clamp from Pelican.
The driver's side was a breeze, only taking me about half an hour to replace. The clamps and pipes weren't rusted like the passenger side.
It does sound better, but it's pretty subtle. Hardly louder than stock, but the tone is better. I'm not sure why you would need the resonated secondary pipe.
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04-24-2018, 04:08 PM
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#18
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Registered User
Join Date: Dec 2013
Location: maryland
Posts: 60
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I cut my rusty bolts off with a metal blade in a sawsall.
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04-24-2018, 05:30 PM
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#19
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Registered User
Join Date: Sep 2016
Location: Central Ohio
Posts: 404
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Quote:
Originally Posted by Cunningr
I was seraching ebay for the cicuit werks bypass pipes, and found they also offer a bypass pipe with resonators. Looks like a cat but is a fesonator, was curious what that supposed to do? Does it change the sound, or is it more affective?
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I have a set of these Circuit Werks secondary resonator pipes on order and incoming to me, arriving probably early next week.
I can take some pictures and post here then, if you wish.
Thanks - DM
__________________
2000 Ocean Blue Boxster S
1980 Ferrari 308 GTSi
2019 Alfa Romeo Giulia Ti Sport AWD
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04-24-2018, 08:35 PM
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#20
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Registered User
Join Date: Mar 2016
Location: Spain
Posts: 993
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Quote:
Originally Posted by Dave80GTSi
I have a set of these Circuit Werks secondary resonator pipes on order and incoming to me, arriving probably early next week.
I can take some pictures and post here then, if you wish.
Thanks - DM
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Thanks I saw pictures, just curious of what the resonator id for and does to the tone.
__________________
2000 Boxster S Ocean Blue Metalic
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