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986 Forum - The Community for Porsche Boxster & Cayman Owners (http://986forum.com/forums/)
-   Performance and Technical Chat (http://986forum.com/forums/performance-technical-chat/)
-   -   Fabspeed Exhaust -- Too Loud? (http://986forum.com/forums/performance-technical-chat/28342-fabspeed-exhaust-too-loud.html)

jhandy 06-13-2011 10:43 AM
Johnny,
The headers with 100 cell cats are very free flowing and when combined with the secondary delete and the muffler, there was not engough backpressure.

Low end torque was fine with the cat deletes and muffler, the headers where the problem. replaceing the OEM muffler fixed the issues, and it is easier to change than the headers.

ocoeeboxster 06-13-2011 11:10 AM
Quote:
Originally Posted by jhandy
Johnny,
The headers with 100 cell cats are very free flowing and when combined with the secondary delete and the muffler, there was not engough backpressure.

Low end torque was fine with the cat deletes and muffler, the headers where the problem. replaceing the OEM muffler fixed the issues, and it is easier to change than the headers.
Is the m22 ss a basic bolt on for the non s cars or will there need to be some modified install done?I got a shop that will do the install for $200 as long as it doesn't get complicated.

jhandy 06-13-2011 12:02 PM
bolts right up. Taking off the OEM is the time consuming part. Some people do it without taking off the bumper. Tried that once, have the knuckle scars to prove it. Its possiable, but taking off the bumper will save time.

Johnny Danger 06-13-2011 02:27 PM
Quote:
Originally Posted by jhandy
Johnny,
The headers with 100 cell cats are very free flowing and when combined with the secondary delete and the muffler, there was not engough backpressure.

Low end torque was fine with the cat deletes and muffler, the headers where the problem. replaceing the OEM muffler fixed the issues, and it is easier to change than the headers.
I agree with you in so far as 100 cell cats are a bit too free flowing for street applications . Moreover, the ecu has to be re-mapped in order to avoid CEL's, and keep the vehicle OBD II compliant . With that said, the combination of a freer flowing cat-back , along with deletion of the secondary cats, in my experience reduced back pressure to the extent that low end and mid range torque suffered . This deficiency was remedied by switching to 200 cell cats, along with some exhaust reconfiguring .

Johnny Danger 06-13-2011 02:32 PM
Quote:
Originally Posted by Allen K. Littlefield
Since I am keeping the stock header and cat configuration, I wonder if I will experience 'de-tuning' with the Charlie Chan muffler and my secondary cat delete pipes? Would make the case for adding the secondary cats again with the CC muffler to eliminate loss of backpressure and consequent 'de-tuning'?

AKL :confused:
The short answer is no . Both the oem muffler and secondary cats are very restrictive . The Charlie Chan muffler should increase flow a bit, at the same time maintain effective back pressure, and provide better sound (subjective) .

ekam 06-13-2011 03:43 PM
Quote:
Originally Posted by Johnny Danger
If anything is causing a loss of low end and midrange torque in Jhandy's vehicle, it's the 100 cell cats. In the past, I experimented with different cell counts. And the use of 100 cell cats resulted in a loss of back pressure; especially when they were located mid stream.
Good call. Afterall no one can explain why the Maxspeed cats have side-entries instead of a straight design. I've never seen that on any other aftermarket performance cats period.

Allen K. Littlefield 06-13-2011 03:49 PM
Quote:
Originally Posted by Johnny Danger
The short answer is no . Both the oem muffler and secondary cats are very restrictive . The Charlie Chan muffler should increase flow a bit, at the same time maintain effective back pressure, and provide better sound (subjective) .

This leads me to ask, what exhaust system did you end up with and did it require a new chip program in order to make it all work?

AKL :confused:

Johnny Danger 06-13-2011 04:44 PM
Quote:
Originally Posted by Allen K. Littlefield
This leads me to ask, what exhaust system did you end up with and did it require a new chip program in order to make it all work?

AKL :confused:

I stuck with the principles of the oem header/pre-cat configuration by having M&M Exhaust in Germany custom fabricate a set of headers and cats using longer, 2 1/2" diameter equal length primaries that flow into a merger collector with HJS 200 cell tri-metal cats. The muffler is a custom cat-back with 2 1/2" diameter inlets and 3" outlets from 9ff, along with secondary cat deletes . It was a tremendous improvement over the oem system; albeit a very expen$ive one . And the sound is just ripping ! Almost to the extent of the Fabspeed race exhaust .

p.s. I did have the ecu re-programmed, however, it was not required .

ocoeeboxster 06-14-2011 08:04 AM
Ok ordered off eBay $299 free shipping .

chaudanova 06-14-2011 07:08 PM
Quote:
Originally Posted by jhandy
That is video is not my muffler, rather a video of someone else with the same muffler that I had. Alan, You are correct in your previous statement.

With the OEM headers and OEM cats, the farting was like you heard on the video, there but not that bad. When I put on the headers and took off the secondary cats, The sound was embarrassing. The awesome sound was always followed by a "PFFFFST" sound that bugged me.

On top of that, When I sent my car to Jake for the IMS replacement, He confirmed that with the headers and cat delete pipes and the muffler, the car de-tuned and retarded the timing because of low back pressure.

He advised me to put on the OEM muffler, and leave the rest. In doing that, I noticed better fuel economy and more low end power, but a wimpy sound.
Do you guys know how to determine if the timing is being retarted, and the car de-tuned/ in limp mode?

Is this possible to tell with Durametric?

Thanks in advance!

Johnny Danger 06-14-2011 07:43 PM
1 Attachment(s)
I must be responsible for at least 3 or 4 members buying this Charlie Chan exhaust . I'm almost deserving of a commission !

Allen K. Littlefield 06-15-2011 04:25 AM
Quote:
Originally Posted by Johnny Danger
I must be responsible for at least 3 or 4 members buying this Charlie Chan exhaust . I'm almost deserving of a commission !
..or condemnation and subsequent boiling in used 5-40 weight...??? All depends on how the sound works out and how SWMBO takes to the sound. She lives with me and I know where you live. And to hell with the microfilm, I have all the ammo and extra magazines... 25 June, day of reckoning when the CC muffler gets installed.

We will see AKL:cool: :dance: :matchup: :dance:

Allen K. Littlefield 06-15-2011 06:05 AM
Quote:
Originally Posted by Johnny Danger
You'll first have to get past my bodyguards !!


....or die trying.....!!!!! :dance: :dance: :dance: :dance: :dance: :dance:

AKL

RandallNeighbour 06-15-2011 02:02 PM
Quote:
Originally Posted by ocoeeboxster
Has anyone put this on there car???
I've had this on my car for 3+ years. I was Che's (Deluboz) test user when he was the first to import them.

Between 2-3k rpm, the cabin resonance can be deafening, especially with the top up in stop and go traffic.

Now with the top down it sounds glorious and with a helmet on and the top up and windows down at the track it really helps to hear when you should shift instead of looking down. That's why I haven't removed it. That and the fact I don't have cash to put on anything different right now.

Johnny Danger 06-15-2011 02:27 PM
Between 2-3k rpm, the cabin resonance can be deafening, especially with the top up in stop and go traffic.


Yikes ! Don't say that, AKL will end up with a Restraining Order against him !! :)

RandallNeighbour 06-16-2011 04:41 AM
Different strokes for different folks, I guess. I just value my hearing and want to guard against nerve deafness. Seriously.

Last thing I want to do is screw up my hearing because my muffler had too much resonance between 2-3k rpm!

ocoeeboxster 06-18-2011 06:50 AM
Fed ex just dropped off the m2 ss cat back and I'll have it installed Monday morning.

Johnny Danger 06-18-2011 07:26 AM
Quote:
Originally Posted by ocoeeboxster
Fed ex just dropped off the m2 ss cat back and I'll have it installed Monday morning.

What about my commission ? :)

ocoeeboxster 06-18-2011 08:59 AM
Quote:
Originally Posted by Johnny Danger
What about my commission ? :)

I hope it sounds as good as it looks.

jacabean 06-18-2011 03:44 PM
post a sound clip


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