apierce918

simple question.
anyone know what the stock exhaust pipe diameter is for a 85.5 944 N/A

i think the turbo's are 2 1/2" but is the N/A the same? or is it 2 1/4"


thanks

Ken D

2.25" for your car.

RMills944

^^ What he said ^^

A good upgrade is going to a 2.5. I love mine and it added quite a bit of power.

SDGuy

I'd like to know the same thing since I was about to get a stainless exhaust tip with a 2.5" inlet for my NA discussed in this thread:
https://rennlist.com/forums/924-931-944-951-968-forum/124411-exhaust-tip-resolved.html
The Ractive T820 tip itself is pretty cheap here although I have no expereince with this vendor:
http://www.carxpressions.com/exterior/exhausttips.htm

Yabo

Is it proven power? did it take from one end of the rpm range and give to another? I was under impression that there was not much to be gained from exhaust on the NA. Did you change the headers too, or just the catback?

RMills944

A muffler will not add as much as it will on a turbo, but the stock muffler is pretty restrictive. The SFR system uses a 2.5" pipe, mandrel bent, with a straight through Borla cat back. I have not had my car dyno'd, but I'd say it added 5-15Hp and the sound is incredible. It'd be annoyingly loud for a daily driver, but it's awesome for my uses.

From what I've read on the board, the cat is actually pretty good and flows better than a high flow from what I've heard and has a built in resinator.

apierce918

excellent, thanks for the replies