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catback size

Old 07-20-2006, 02:30 PM
Thread Starter
Join Date: Jul 2006
Posts: 19
Default catback size

hey guys, i was wondering what would be the best size of pipeing for a catback on a gsr engine. i still want low end power and i use it as a dialy driver,but i want the extra kick.my friend said that a 2.5 catback would take all of my low end power.but in the end which size would be best.thanks.
Old 07-20-2006, 06:53 PM
Join Date: Feb 2006
Posts: 192
Default RE: catback size

2.5 is good. Any larger than that, and you'll start to negatively change the backpressure.

If you had a turbo, you could go up to a 3 inch to accomodate the increased air coming in the intake.
Old 07-20-2006, 11:01 PM
My04Civic's Avatar
Join Date: Jun 2006
Posts: 4,161
Default RE: catback size

i personally would say not to go over 2.25...its all you really need
Old 07-20-2006, 11:27 PM
civicexracer's Avatar
Join Date: Jul 2005
Posts: 5,802
Default RE: catback size

2.25 if u stay n/a. 3 if ur gena turbo.
Old 07-21-2006, 01:19 AM
Join Date: Aug 2005
Posts: 992
Default RE: catback size

yea basically stay at 2.25" for an N/A and 2.5" or 3" for turbos. that way you don't lose low end for the daily driving
Old 07-23-2006, 08:34 PM
HCF Member
Join Date: Jul 2006
Posts: 1,041
Default RE: catback size

^+1....definetly agreed
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