Exhaust.. converting from 3" to 2.5"

[Metallic36]

I bought a turbo with the downpipe, the downpipe has a triangular shape on the end and three bolt holes where it would connect to the midpipe. I am going to have to buy a new midpipe anyway since mine has the j/midpipe combo and I won't need the j-pipe part. The downpipe is 3" in diameter. My exhaust is 2.5" and I'm wondering if I just need a different exhaust or if there is a way to make it convert from 3" to 2.5" and I'm also worried about the flow.. if the flow would get backed up since it goes into a 2.5" exhaust?

[Outlawstar98]

I bought a turbo with the downpipe, the downpipe has a triangular shape on the end and three bolt holes where it would connect to the midpipe. I am going to have to buy a new midpipe anyway since mine has the j/midpipe combo and I won't need the j-pipe part. The downpipe is 3" in diameter. My exhaust is 2.5" and I'm wondering if I just need a different exhaust or if there is a way to make it convert from 3" to 2.5" and I'm also worried about the flow.. if the flow would get backed up since it goes into a 2.5" exhaust?
well if you go to any car shop (like advance auto) they sell pipes that go from 3" to 2.5" ect. ect. so you can do that, and i dont think the flow will be backed up IMO, it will still run nicely.

[Metallic36]

Well hell, didn't think of that, thanks.


well if you go to any car shop (like advance auto) they sell pipes that go from 3" to 2.5" ect. ect. so you can do that, and i dont think the flow will be backed up IMO, it will still run nicely.

[cmahlig]

yea, autozone or go to an exhaust shop. they have a machine that will stretch the pipe out

[Jboost]

don't order a new mid pipe either just have them cut the J off and stretch the one you have and you will be money.

[505zoom]

Go with a new 3" midpipe, and 3" cat-back. ;)

Depending on how much boost you end up running, the taper might become a bottleneck. Better safe than sorry. :)

[Speed3.5]

^^^ not really 505zoom, there won't be a problem with that exhaust even though I agree that she should get/make it full 3".

A friend of mine has the same thing 3" down pipe and 2.5 there after on A4 and that thing sounds like a mean machine.

as long as you don't have a 3" in somewhere in the middle of 2.5" section there shouldn't be any bottle necking.

[Notorious_V.I.C]

I'll have my 2.5" J-pipe midpipe with a high-flow cat for sale once I find out from a member if he can sell me his.
Let me know if thats what your looking for or if it will work.

[ForceFed]

I say a 3'' to 2.5 will be fine...Unless you really plan on gong for record numbers here.
I am only gong to run a 2.5'' pretty much all the way back..Minus the 3'' DP.

[Metallic36]

I have an ApexR1 j-pipe midpipe exhaust right now.. I just bought a turbo and it had a 3" downpipe with it.. trying to find a solution that would make it possible to bolt up the downpipe to my exhaust.. the downpipe connects with three bolts.. obviously I believe I will have to get a new 3" midpipe, or get a reducer to make it fit and still use my ApexR1 exhaust.


I'll have my 2.5" J-pipe midpipe with a high-flow cat for sale once I find out from a member if he can sell me his.
Let me know if thats what your looking for or if it will work.

[Notorious_V.I.C]

Oh yea, sorry I didn't read it right.