2.5 inch or 3 inch exhaust

Old April 16th, 2013, 05:58 AM
  #1  
Registered User
Thread Starter
 
timothypaul's Avatar
 
Join Date: Sep 2008
Location: Naples, FL
Posts: 119
2.5 inch or 3 inch exhaust

Hey Folks - I am contemplating redoing my exhaust.

Its a 455 CID - moderately worked. - Using Doug's headers.

My buddy has a 66 GTO w/ a 455 and he insists I need to go with a 3 inch exhaust.

Wondering for the extra money - is it worth it.

Thanks...TP
timothypaul is offline  
Old April 16th, 2013, 06:07 AM
  #2  
Registered User
 
Join Date: Aug 2009
Posts: 322
Try this thread...
Erinyes is offline  
Old April 16th, 2013, 06:11 AM
  #3  
Connoisseur d'Junque
 
MDchanic's Avatar
 
Join Date: Sep 2010
Location: The Hudson Valley
Posts: 21,180
Well, if you're making 680HP, then you need 3" pipes.

If you're "only" making 460HP, then 2" pipes should be fine.

- Eric
MDchanic is offline  
Old April 16th, 2013, 06:41 AM
  #4  
Registered User
 
Gunmars's Avatar
 
Join Date: Apr 2012
Location: PA
Posts: 56
I can't speak for the performance aspect of it or exactly what year of car you are putting it on. But if your going to buy 3" kit for A-body cars I would be cautious. I purchased 3" Flowmaster American Thunder kit for my 71 Supreme and had clearance issues even after modifications to the pipes. Another brand kit might be fine or you could always go custom bend to hopefully avoid this issue. Luckily for me I had a Chevelle which the kit fit amazingly and a 2.5" Flowmaster American Thunder fit perfectly out of the box.
Gunmars is offline  
Old April 16th, 2013, 06:46 AM
  #5  
Registered User
 
Mikes65's Avatar
 
Join Date: Sep 2009
Location: Oxford CT
Posts: 194
2.5 will work and sound nice
Pypes street pro stainless steel- not polished- is a great deal
Mikes65 is offline  
Old April 16th, 2013, 07:26 AM
  #6  
Registered User
 
Join Date: Aug 2005
Location: Braceville, Ohio
Posts: 1,539
I would go with the 2.5" also, it's more than enough for your needs. I would put in a torque tube but it's your call. 3" is overkill and as one poster wrote, it can cause other problems. Kind of like opening up a can of worms. Good luck, Ken
Kennybill is online now  
Old April 16th, 2013, 07:07 PM
  #7  
Registered User
 
Join Date: Jan 2010
Location: central Indiana
Posts: 1,295
I have the Torque Tech 3 inch system on my car, it fits great. It took a little effort to get it to clear in the front (I'm running a X pipe) but that is because of the Gear Vendor. It required the X a little further towards the rear of the car than would be normal.
matt69olds is online now  
Old April 17th, 2013, 08:27 AM
  #8  
Registered User
 
Join Date: Apr 2012
Location: Bradenton, FL
Posts: 1,114
NOT worth it....you say "moderately worked", doesn't mean "race car", I'm assuming. The amount of noise and the cost of using a smaller pipe will make ya happy.
brownbomber77 is offline  
Old April 17th, 2013, 08:33 AM
  #9  
Registered User
 
chadman's Avatar
 
Join Date: Mar 2010
Location: Wakeman, OH
Posts: 734
I have a 3" Torque Tech on my '65 w/Dynomax Super Turbo mufflers and a complete Pypes 2.5" Street Pro system on my '68. The '65 w/3" is actually quieter. With that said, unless you plan to make passes at the drag strip and run into the 11's I would go with the 2.5" system. I also prefer the Dynomax Super Turbo mufflers over the Pypes mufflers.
chadman is offline  
Old April 17th, 2013, 08:34 AM
  #10  
Moderator
 
oldcutlass's Avatar
 
Join Date: Oct 2009
Location: Poteau, Ok
Posts: 32,281
I'd go with a 2.5 and install a set of exhaust cutouts if you want performance.
oldcutlass is online now  
Old April 17th, 2013, 08:35 AM
  #11  
Registered User
 
Join Date: Apr 2012
Location: Bradenton, FL
Posts: 1,114
Oh, yeah..turbo style mufflers, too...cheap...quiet...don't drone...maybe some people like drone...hmmm...
brownbomber77 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dz442
Parts For Sale
6
February 23rd, 2018 04:41 AM
The Stickman
Parts For Sale
0
July 12th, 2014 11:13 PM
1971viking
Big Blocks
3
August 8th, 2012 06:20 AM
shaks 442 clone
Other
20
March 29th, 2008 08:31 PM


Thread Tools
Search this Thread
Quick Reply: 2.5 inch or 3 inch exhaust


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.