08-01-2015, 01:03 PM
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#1
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Registered User
Join Date: Jun 2015
Location: Granada hills, ca
Posts: 11
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Custom magnaflow mufflers too much drone. Need help with ts bypass
Good afternoon, i recently did a muffler delete on my 99 2.5 and it was too loud so I ordered x2 magnflow #10415 mufflers and it definately sounds much smoother but too much drown on the hwy. I did some reading on the top speed cat bypass and saw that some people got reduced drone.. Just wanted to follow up with anyone that has experice with the bypass. Thank you!
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08-01-2015, 01:05 PM
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#2
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Registered User
Join Date: Jun 2015
Location: Granada hills, ca
Posts: 11
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08-01-2015, 01:58 PM
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#3
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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Hey Keanu; Looks like you live in Good ol California and are subject to our smog laws. Your 99 only has 2 cats and must remain where they are in order to pass smog inspection. That eliminates the test pipe installation on your car, well legally anyway. You may have some luck with the clamps some have been having results with. This was the reason I went the way I did with my install of the 03S muffler on my 98. Good luck
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08-01-2015, 05:06 PM
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#4
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Registered User
Join Date: Jun 2015
Location: Granada hills, ca
Posts: 11
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Yes sir! Smog here does suck and to make things worse cops in my area are anal about exhaust and anythibg modified. Mind giving me some more info on the clamps im not sure what clamps youre speaking of. Unfortunately ive onlynowned the car for 2 months.
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08-01-2015, 05:07 PM
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#5
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Registered User
Join Date: Jun 2015
Location: Granada hills, ca
Posts: 11
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08-01-2015, 08:00 PM
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#6
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Registered User
Join Date: Nov 2009
Location: PA
Posts: 170
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if you don't want to touch the cats, use different mufflers.
I bet those magnaflows drone a lot. I did the same as you did but used turbo thrush mufflers....they have the short/small ones that fit...and no drone and sounded awesome.
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08-01-2015, 09:10 PM
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#7
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Cat bypass won't fix the drone, sorry. Stock exhaust + PSE mod is the only way I know to get good sound and zero drone. All 2-can muffler setups just drone big time. It's a physics thing.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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08-02-2015, 01:44 AM
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#8
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Registered User
Join Date: Jun 2015
Location: Granada hills, ca
Posts: 11
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Do you have pics and part # geetee very interested!.
I was looking another stock set up i actually just picked up the dual tip one since i wasnt a fan of the single tip it came with
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08-02-2015, 08:44 AM
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#9
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Registered User
Join Date: Jan 2014
Location: Albuquerque, NM, USA
Posts: 741
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It's a physics thing for sure ...
From Porsche Boxster Story by Paul Frere ...
Quote:
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The silencer is a double-skinned rustproof steel unit. It is rigidly bolted to the gearbox because the entire rubber mounted engine, gearbox and exhaust unit is used as a vibration damper for the entire car structure.
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__________________
Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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08-02-2015, 10:26 AM
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#10
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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08-02-2015, 11:18 AM
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#11
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,940
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Quote:
Originally Posted by Topless
Cat bypass won't fix the drone, sorry. Stock exhaust + PSE mod is the only way I know to get good sound and zero drone. All 2-can muffler setups just drone big time. It's a physics thing.
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Topless,
A few years ago I bought the (sport) SpeedArt exhaust on a group buy at the Planet 9 site and it sounds awesome with zero drone..
No regrets whatsoever.
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08-02-2015, 01:07 PM
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#12
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Registered User
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,509
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If you want an exhaust with no drone i would recommend a bypass mod on the original exhaust like this:
Regards from germany
Markus
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08-02-2015, 02:05 PM
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#13
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Registered User
Join Date: Oct 2014
Location: Santa Rosa, CA
Posts: 520
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Quote:
Originally Posted by Smallblock454
If you want an exhaust with no drone i would recommend a bypass mod on the original exhaust like this:
Regards from germany
Markus |
Will it work on 2003+ models?
I once tried to install a PSE but it wouldn't fit because of the rear bumper which has lower braces interfering with the pipes.
__________________
2003 2.7 Boxster - Tiptronic - Carrera wheels - OBC - Red calipers - Cat pipes - Modified muffler - Rear speakers - K&N - Litronics
2006 V6 Mustang
2008 ML 350
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08-02-2015, 02:15 PM
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#14
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Registered User
Join Date: Jun 2014
Location: LB, Germany
Posts: 1,509
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It's tight, but it was done also on 2003+ models over here in Germany. Has to be done very precise and with not too big diameter for the tubes.
Additional photos from a 2003+:
Regards
Markus
Last edited by Smallblock454; 08-02-2015 at 02:20 PM.
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08-02-2015, 02:30 PM
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#15
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Quote:
Originally Posted by Gilles
Topless,
A few years ago I bought the (sport) SpeedArt exhaust on a group buy at the Planet 9 site and it sounds awesome with zero drone..
No regrets whatsoever.
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Was this a light weight 2-can exhaust as pictured in post #5, or the $2k rework of a stock exhaust? A very rare outcome for a 2-can system. 1/1000
Like this one?
http://www.vividracing.com/catalog/-p-35186.html?utm_cmp=FullFeed&gclid=CJGHhc6vi8cCFYdrfgodivgFog
The PSE mod can give the same results for about $200.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 08-02-2015 at 02:45 PM.
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1998 Porsche Boxster
Lil Red
2009 Porsche Cayman 2.9L
Boxster
Linear Mode
