New I-pipe diameter?

[99BlackW68]

the previous owner of my car installed a magnaflow muffler and 2.5" dual pipes comming out to the back of the car. he did not install a full catback system though, leaving the I-pipe to stock 2.25". Now what would be a smart upgrade for the I-pipe? I'm thinking either 2.75" or 3". Im gonna be running 9psi supercharger, and i have headers. ive read up on backpressure and exhaust velocity, but i just need help on which size would be better. thanks.

[badinfluenceRS]

Re: New I-pipe diameter?

what is the inlet to the muffler?

I would match that, a 3" I pipe to a 2.5" muffler inlet would be kind of pointless

[99BlackW68]

Re: New I-pipe diameter?

good call. ill find out tomaro when i go back to work on the headers install

[IDoVoodoo]

Re: New I-pipe diameter?

don't forget the over axle pipe

[99BlackW68]

Re: New I-pipe diameter?

haha yeah i know. i meant all the piping from the cat to the muffler