Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 02-07-2016, 02:39 AM   #1
Registered User
 
Join Date: Dec 2013
Location: Dahlonega , Georgia
Posts: 1,070
adding exhaust resonators in cat delete pipes

My current exhaust is a tad on the loud side with some drone with the two can GHL muffler. I have cat delete pipes on my 02 S and was thinking about adding some resonators. I'm thinking one per side in the cat delete pipes where they feed into the u-bends. I think there is easily enough room for a 3.5 " case diameter resonator with 12 " overall length and maybe a little longer. Off the top of my head I don't remember the ID/OD of the delete pipes and I know I will have to transition from the resonator size ( 2.250 " ? ) to the u-bends ( 2 " ? ) but any competent muffler shop can do that. So are any of you running cat delete pipes with resonators ? What resonators did you use ? Any pics of your setup ? I'm thinking of using something like these. My goal is to just tone down the sound a little ( 10 - 15 % ) and cut down on the drone.


Universal Exhaust Resonator, 12" Long - Vibrant Performance
__________________
2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution.
rfuerst911sc is offline   Reply With Quote
Old 02-07-2016, 11:32 AM   #2
98 Arctic silver 986
 
tommy583's Avatar
 
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,214
Garage
This thread might interest you.

GHL Exhaust w/Eisenmann Tip - w/Drone Killer!
tommy583 is offline   Reply With Quote
Old 02-07-2016, 11:46 AM   #3
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,189
Garage
Just put a stock muffler back on. The U-bends are 1.75"
__________________
2000 S Speed YellowLN 3.6L cylinders & pistons, triple row IMSB upgrade, R&R connecting rods, billet tensioner paddle,oilpump driveshaft.Heads rebuilt by F6I with new valves & springs.Cayman airbox & MAF housing, 996 intake plenum & 75mm T/B. NHP sport converters &Dansk muffler
BYprodriver is offline   Reply With Quote
Old 02-07-2016, 12:32 PM   #4
Registered User
 
Join Date: Dec 2013
Location: Dahlonega , Georgia
Posts: 1,070
Quote:
Originally Posted by BYprodriver View Post
Just put a stock muffler back on. The U-bends are 1.75"
There is no way in he$$ I'm putting the OEM boat anchor back on !!!
__________________
2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution.
rfuerst911sc is offline   Reply With Quote
Old 02-07-2016, 12:52 PM   #5
Registered User
 
Join Date: Dec 2013
Location: Dahlonega , Georgia
Posts: 1,070
Quote:
Originally Posted by tommy583 View Post
This thread might interest you.

GHL Exhaust w/Eisenmann Tip - w/Drone Killer!
Haha I responded to that thread and forgot about it ! Thanks for posting the link.
__________________
2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution.
rfuerst911sc is offline   Reply With Quote
Old 02-07-2016, 05:23 PM   #6
98 Arctic silver 986
 
tommy583's Avatar
 
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,214
Garage
Quote:
Originally Posted by rfuerst911sc View Post
Haha I responded to that thread and forgot about it ! Thanks for posting the link.
Glad I could jog your memory
tommy583 is offline   Reply With Quote
Old 02-07-2016, 06:19 PM   #7
Registered User
 
Join Date: Dec 2015
Posts: 150
Why not use the aftermarket high flow secondary catalyst pipes . They are available all stainless on ebay for $299 . The cats will act similar to resonators and quiet the exhaust and flow better than stock with a one piece design which shouldn,t rust. Unlike an aftermarket resonator which will likely be mild steel.
johnsjmc is offline   Reply With Quote
Old 02-08-2016, 10:23 AM   #8
Registered User
 
Join Date: Jul 2014
Location: Boston, UK.
Posts: 78
Add motorbike decibel killers on the 'C' tubes and that will get rid of the drone completely.

Dualist is offline   Reply With Quote
Old 02-08-2016, 02:50 PM   #9
Registered User
 
Join Date: Dec 2013
Location: Dahlonega , Georgia
Posts: 1,070
Dualist it looks like the inserts you used are the same length is that correct ? Some other posts suggest that one of the inserts should be longer than the other. The theory is difference frequancies due to different lengths cancel the drone. So you are happy with how yours turned out ? Did you weld the inserts to the u-tubes and then insert into the muffler ?
__________________
2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution.
rfuerst911sc is offline   Reply With Quote
Old 02-08-2016, 04:15 PM   #10
Registered User
 
911monty's Avatar
 
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,259
Garage
I am having a real difficult time understanding how it is desirable to install a supposedly freer flowing performance enhancing exhaust and then restrict the flow at what appears to be an already restrictive section. Just to use a $120.00 muffler on an engine that I'm sure you just spent more than $20k on?Especially with an engine that probably now needs all the exhaust flow it can get. Am I missing something? Don't mean to offend but I fail to see the logic. Sorry.

Last edited by 911monty; 02-08-2016 at 04:17 PM. Reason: Additional thought.
911monty is offline   Reply With Quote
Old 02-09-2016, 08:09 AM   #11
Registered User
 
Join Date: Dec 2013
Location: Dahlonega , Georgia
Posts: 1,070
911monty that is a valid question. Right now i am just gathering data. But i have already been in discussions with jake raby he built the engine. I will not move forward with any permanent solution until jake says good to go. Anything i try will be reversible and will be proven on the dyno.
__________________
2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution.
rfuerst911sc is offline   Reply With Quote
Old 02-09-2016, 11:32 AM   #12
still plays with cars...
 
BoxsterSteve's Avatar
 
Join Date: May 2011
Location: Baden, ON, Canada
Posts: 1,070
Garage
Quote:
Originally Posted by rfuerst911sc View Post
911monty that is a valid question. Right now i am just gathering data. But i have already been in discussions with jake raby he built the engine. I will not move forward with any permanent solution until jake says good to go. Anything i try will be reversible and will be proven on the dyno.
Could you not just rip the guts out of your secondary cats and reinstall? You'd be creating an open chamber and reusing the cat-free pipes. It would look stock to an emissions nazi too.
__________________
Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
BoxsterSteve is offline   Reply With Quote
Old 02-09-2016, 06:11 PM   #13
Registered User
 
stelan's Avatar
 
Join Date: Oct 2015
Location: Austin
Posts: 395
I replaced the heavy muffler with two s pipes and two hotdog shape resonators and a dual ss tip, it is the best sound I ever heard in my life, I got it done in central mexico while traveling and it was less than 300 bucks all included, exchange rate helps a lot
stelan is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 11:43 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page