MatT3T4

I know a large decrease in back pressure can hurt an NA motor. I plan on a HUGE turbo project late this year. For now, after I lower the car an inch or so, I want to work on the exhaust. I will probably buy a couple of A'pex N1 mufflers and slap them on the stock piping. I don't want to buy a full exhaust, because for the turbo, I will need a 3" diameter, but that is way too large for NA. Has anyone done this, how does it effect sound? Pictures?

Rob_O

Large decreases in flow velocity hurt performance, engines do not like backpressure. If you go with an exhaust too big, below a certain amount of flow you will have a mass of used air "parked" in the pipes blocking what is coming out of the exhaust ports.

Rob_O

Bean

iTrader: (1)

A single 3" way too large for NA? not from what i know... a dual 3" would be if thats what you're referring to

a 3" single exhaust would be perfect; or a 2.5" dual

MatT3T4

Really? I didn't think a single 3" would be good for an NA application. More like a 2.5"...But anyway, I think I may just keep the stock pipes for now, and put the mufflers on, and upgrade the piping after the turbo.

Keith13b

iTrader: (3)

are you talking about a 300 or 400?