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2.5'' is correct.

Howver, it has a seperate elbow for wastgate gas flow.

this will reduce turbulent air flow in your exhaust and in-turn

increase response and power.

However, if i were you, buy a 6 bolt dump pipe flange and get one made up

for about $2-250 fitted.

However, if i were you, buy a 6 bolt dump pipe flange and get one made up

for about $2-250 fitted.

Where to find a dump flange? I'm in to making my own dump/down pipe but can't find the flanges...

i have one and it works fine. it is an upgrade on the stock one.

it all depends on whether you already have an upgraded front pipe or not. if you do then get one of them. if you still only have a stock front pipe then get a full dump/front pipe.

my car already had a 80mm front pipe when i got it. and i didn't really want to spend hundreds of dollars replacing something that worked fine.

the other option you have is to cut the wastegate part of the pipe where it goes back into the dump pipe, cover the hole, then add some pipe on to the end of the wastegate pipe, drill a hole in the front pipe and have it plumb back into it.

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