I know some one selling a used 06 civic si muffler I was just curious if anyone know how they sound and whats the diameter of the piping on it? I would be bolting it up to a 2 1/4 exhaust with a test pipe, dc 4-1. I have a gsr muffler now that im using on that setup. i like the setup I just figured that si muffler a lil bit more flowing.

 

i have it on my eg.

its gunna require some fab work on the muffler so it bolts up

sound SEXYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY

 

I was gonna have it welded. Is it more free flowing than the gsr muffler?

 

i have the option HFP(honda factory performance)si exhaust, different form the stock one on so it, so im not sure