hey i was just wondering what the best size of piping for single exhaust on a 350z, 2 and a half or three inch??

 

Depends what you want to do.

F/I - 3''
N/A - 2.5''

 

3" regardless, definatly for all motor I would go smaller than that. As far as F/I it depends on the setup you want to run, If you are going with twins I recommend a dual 3" And for a single turbo, I recommend a single 3"

 

are you sure?? i have 3 inch piping and im n/a... and i see no problem....

 

Can you tell us more?

On the HR teardown thread, they used a Greddy EvoTT dual exhaust with 2.75inch piping, and I heard no mention of Low end powerloss. I'm thinking the common belief that 2.5inchs is big enough is wrong.

 

A dual 2 1/2" and a single 3" should flow and perform the same, if the designs and components are similar is effect. The pipe size overall is equivalent.

If your going FI - turbo especially - you'd likely want 3" - though 2 1/2" will work - it all depends on boost and power goals.

Rick

 

I have lebree resonated test pipes which i believe are 2.5 to a custom 2.5 to 3 inch oulet y-pipe to a custom 3 inch b-pipe all the way back to a single hks canister.

 

I've seen 4cyls N/A run 3inch Pipes, and gain as much as 15whp, and lose nothing down low.

And Actually, as Shop here tested a dual 2.75 Inch pipes on a N/A Z and Made nice Numbers, and lost nothing down low.

Usually, the bigger the pipe, the better, I say Dual 2.5+ or go home.