3" Exhaust - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 09-22-2009, 03:03 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Bwayney's Avatar
 
Join Date: Feb 2009
Location: Indiana
Posts: 260
Thanks: 0
Thanked 0 Times in 0 Posts
Bwayney is on a distinguished road
Default 3" Exhaust

no one makes custom exhaust for our cars so im thinking of bringing into a shop for a "muffler man special"

Now alot of people say you will lose low end power cuz of backpressure but ive heard that on forced induction cars you dont need backpressure.

Is 3" a waste of money?
Bwayney is offline   Reply With Quote
Old 09-22-2009, 03:09 PM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

I'm still running 2.5", 3" is a bit much.
Danthurs is offline   Reply With Quote
Old 09-22-2009, 03:41 PM   #3
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Many things will cause a feeling of lost power due to added flow. When I added headers with only a pulley and pcm, it felt as though some of the low end torque had disappeared. Yet when the rpm'* increased faster than before and flowed better to allow for more top end power it was clear that the power didn't disappear, it shifted.

3" exhaust is a bit much and I'll even go out on the limb and to mention it is too much. My setup has been a test of exhaust etc. Only recently did I find that I am outflowing the 2.5" exhaust that makes up my system from the cat back.

S1X cam
N* throttle body
4" intake
Mezeire water pump
8 rib belt
SLP headers
Gen V supercharger
All these mods above and I didn't appear to be outflowing 2.5".

Added
Stage 3 heads
1.8 rockers
And I began noticing an issue with exhaust.

All these mods added up create a lot of flow. The 2.5" was good until the last two mods. Then the total of all the mods hit a level of outflowing.
BillBoost37 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
"ban him" in "new car" thread ga93sle Lounge 3 09-23-2006 09:23 PM
The difference between "guts" and "balls" sse1990 Lounge 8 08-31-2006 11:31 PM
Where is the "chime" / "dinger"? PPrash 1992-1999 6 11-21-2005 09:11 AM
'91 L "snakes" intake on a "C" engine ? padgett 1987-1991 5 07-21-2003 08:12 PM
"D" or "OD" ? BusMaster007 1992-1999 23 01-09-2003 03:09 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:54 PM.


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.