riiidaa

iTrader: (2)

Please vote / reply only if you're confident in your answer.

I have an Afterburner Vortex exhaust system for classic, inc an 100 cell sports cat.



When advertising it, I'm being asked "Is it 2 & 1/2", or 3" ?"

Pass, all I know is it bolts on the classic turbo car and that you should get it mapped after doing so. My plans changed and ever since I've had it - it has sat in the shed.

So in attempt to find out I took some photos

Don Clark

Looks like a 3" downpipe that reduces to 2.25" (std oem size) just before the flange.

riiidaa

iTrader: (2)

Thanks mate

jaygsi

iTrader: (46)

Agreed, this isn't on your voting choice

riiidaa

iTrader: (2)

yesah i'm a little confused as people ask if it's 2.5" but oem wrx is actually 2.25"? So is everyone saying 2.25 when they really should be saying 2.25?

markjmd

iTrader: (11)

Pipework on my UK2000 turbo is definitely 63mm, or 2.5", and I've swapped and changed back-boxes and centre-sections often enough to be sure it's compatible with all variants of turbo-equipped imports.

jaygsi

iTrader: (46)

I've never come across a 2.25" system on a turbo. There all 2.5" bore as standard. After market systems eg down pipes can be advertised at 3" bore but then they narrow to 2.5" bore.

As i was looking for a sports cat for my impreza and had to make sure i bought correct down pipe, i needed 3" all the way to connect to a 3" centre pipe.

Don Clark

The OD of the OEM centre pipe on my saloon is 2.5/16" giving a bore of 2.1/4".

as per this photo already posted in this thread



same as the Forester before it and the P1 before that.


63mm equates to 2.3/8" which gives a bore of about 2.25" as well.

markjmd

iTrader: (11)

You need a new calculator.
https://www.google.com/search?client...oe=utf-8&gl=uk