Custom downpipe???

[90TGP]

I was wondering if my local exhaust shop could fab up a custom downpipe for the TGP? Like 2 1/2".

I know that downpipes alone add a lot of horsepower to Supra's and other turbo imports. Why not the TGP.

[Black Pheonix]

i imagine it would, the crush in the pipe is pretty obvious, why couldn't the factory just do it right?

[Chris A]

what crush are you speaking of? for the most part the pipe is pretty uniform, but I really don't know what kind of gains you can expect. Most other cars suffer from sharp bends (eclipses GN's) in the downpipe that the aftermarket helps remove/improve with bigger piping. Then if you go to bigger turbo's you need bigger pipe anyway. I might be worth trying , but I honestly wouldn't expect a huge improvment or folks lining up to make you one.

Chris

[Black Pheonix]

i only looked at it once but i thought i saw rippled pipe where it bends down from the engine, crush bended. Maybe that's not the downpipe?

[Chris A]

i only looked at it once but i thought i saw rippled pipe where it bends down from the engine, crush bended. Maybe that's not the downpipe?

I think that may be a bit of an illusion as the pipe expands up to the turbo to house the wastegate flapper. Looking from the inside the the pipe is fairly uniform in diameter.