Stock Down pipe

[pontiac6269]

Does cutting off the necked down portion of the down pipe and welding in a piece the same size as the rest of the pipe make a difference?

Thanks,
Eric

[IL KIM]

Yes, it should, but sounds like a lotta work IMHO.

[Keller]

What are you trying to do? Whatever minute gain you would get from expanding the neck of the downpipe would likely be trivial. And it would be far exceeded by a step up to a larger and/or improved pipe such as a Houston-style. Unless you are trying to eek every last ounce of performance out of a completely stock appearing combination, I hardly think the effort in doing that would be worth it.

Most big downpipe gains seem to come at large boost levels, anyway.

[IL KIM]

Better said Keller!

[turbofrank]

You can do it . Cut it as straight as possible take both parts to welder. Thats what i've done when trying to seperate a stubborn pipe from cat.
Cut as close to bend as possible remember cat pipe is a couple inches
long.

[Keller]

I believe he was referring to the swaged portion near the turbocharger.

[pontiac6269]

I was talking about the swaged end at the turbo. Was thinking this since I have the turbo off and doing some other minor mods.