or am i just thinking too much?? heres what i have.

Gsr b18c1
PnP head
Crower valvetrain
AEM SRI
Tri-Y Header, 2.5 collector
Chipped ECU with Chrome
in a Eg hatch

maybe a tune in the future

custom muffler shop piping 2.5 all the way down to the muffler
am i losing power due to the size? i was reading online how this could be a overkill

http://www.team-integra.net/sections...p?ArticleID=48
^^^^
2-1/4" up to 210HP @ the flywheel (about 180-185 whp)

2-3/8" (60mm) up to 235HP @ the flywheel (about 200-207 whp)

2-1/2" up to 265HP @ the flywheel (about 225-235 whp)

2-3/4" up to 325HP @ the flywheel (about 275-285 whp)

 

also i would not be adding cams or other mods.

 

do you have a dyno graph?

 

Team Integra is a joke on there exhaust size. "You need the back preassure!" There are a couple dyno graphs on HT where someone took a 2.5 Exhaust off and put a 3 Inch Exhaust on and picked up 10 HP. 2.5 is not to big by any standards. 2.5 is actually normal, and on certain builds, can be to small for max HP.