2.5 or 3.0 exhaust

[scremn]

I purchased a 2.5 in universal X Pipe kit and a set of Dynomax 2.5 in
Ultraflo welded mufflers about a month ago.A couple of my car buddies
think i should use a 3 in system. I would like your opinion on this. The
car is a 72 Pro Street Demon. Motor is a .030 over 340, 11-1 Trw pistons,
Cam Dynamics solid lifter cam .585 lift, duration @ .050 is 260, Hooker
super comp headers 1.75 in diameter, 750 Holley with Proform main body,
4:56 gears with a 29 in tall tire. Heads are ported X and a Victor Jr intake.
Motor spins to 7000 rpm .Thanks for your input.

 

[RustyRatRod]

2.5" will support your combo just fine. Tell your friends you don't need to compensate for anything like they do. lol

 

[duster340]

i would have built a 3" system but thats mainly since i like to have alitle space to grow,
i think that 2½" will be just at the edge of being enough for the level you are at, i dont think it will be a big loss in power, nice thing about keeping pipesize down is that the car wont be louder than necesary, 3" on a highcompresion,big cam 340 has a habbit of getting alitle loud.
for all out power 3"
if you want a car that is alitle easier on your neighbours ears and that will be alitle more stealty and can live with the possbillity of a small loss in power go for 2½"
since you already have the 2½" kit i would use it