I am running a 4" dump pipe, 3.5 CAT and twin 2.5 inch centre muffler (XFORCE) and have left the standard rear 2.25 muffler on the car, does anybody know how restictive the rear muffler is and any gain I might get from going the XFORCE rear muffler?

I am running a 4" dump pipe, 3.5 CAT and twin 2.5 inch centre muffler (XFORCE) and have left the standard rear 2.25 muffler on the car, does anybody know how restictive the rear muffler is and any gain I might get from going the XFORCE rear muffler?

Shine a torch in there and see for yourself. Its less than 2 inch.

Shine a torch in there and see for yourself. Its less than 2 inch.

Thanks arronm. Off to prestige I go for a new XForce rear. I prefer the twin pipe setup anyway

Go the Quads Doc, go the Quads.

arronm is right on the money - 2.25 pipes go down to 1.75 inside the mufflers

Doc can you post or send me a pic when it's done? I had one hand on the jaw staring at the tail yesterday wondering if it would look any good on the phoon.

Cheers

Doc can you post or send me a pic when it's done? I had one hand on the jaw staring at the tail yesterday wondering if it would look any good on the phoon.

Cheers

Hi R Spec. I am a technological idiot, but I will try. I am not going the Quads this time because it's really just extra weight and I don't want the car chopped because the rear bumper won't cut as neatlt as what the BAs do. Thanks for the sizings Senna_T, that's a big downsize, hopefully I won't need a re tune.

Cheers Guys

the change in mufflers won't make a big enough difference to require a re-tune IMO but it will free up the top end a little with your power level

Go the Quads Doc, go the Quads.

may only be cosmetic, but I love them !!!

may only be cosmetic, but I love them !!!

that does look nice, but I prefer old school - twin 3 inch.