Has any one dynoed these against each other yet? I searched about this and I found little reliable info.

I did find some one making 176hp and 135tq with the 2.5" header but there are to many variables to know for sure if it's worse or better. I made 140tq and 176 hp with the 2" just to compare.

XxTokesxX did a hotshot vs a ssac 2.5, and gained 7whp. Check his threads

I could'nt find the thread your talking about. I think I'll just go for it any ways and see what happens with the 2.5" collector and exhaust. I think it will not lose any torque after I get the realtime and a good tune. ;)

http://www.sr20forum.com/general-sr20/180699-finally-dyno-tested-daily-driver-pics-vids.html

Cool he gained 6-7 wheel torque on top of the 7whp!

From memory, there were better gains with the smaller 2.25" collector over the 2.5".