ok i have an 89' suburban 350 tbi and i want 3" pipes on it for that mellowed out sound and im gonna put dynomax super turbo's . but my mechanic told me that i should'nt go any bigger than 2.5"... i know its my car but i really value his opinion

 

you'll lose torque and maybe low end hp with the 3in pipes. just like headers or intake that are to big for a setup.

 

tru but is it still possible to get a sound like this
with 2.5's?

 

also not going to be any faster possibly run a little lean my 2 cents run a larger cat back sytem with the muffler you like for sound. will not gain anything on a tbi thats noticable 4 the money except noise

 

well its a suburban im not going to race it.

 

U wanna dual it out bro or just put a single out the back?

Also do u got any headers on that thing ?

I would listen to ur mech ,my boys have all told me the same thing .That's why im gonna put in a dual system on mine in 2.5 inch piping .

 

the stock exhaust is 2.5 in off the manifold to y-pipe and single 3in. if u did true duals i would run 2.5 all the way.

 

yea thats what i was thinking because i have true dual 2.5's right now but one of them have an exhaust leak...