Well, I purchased a garett t-25 turbo for my ZC which i plan on building a custom turbo for. I have decided to use an HF manifold along with a t-25 hks flange which im gonna weld onto the manifold. Does anyone have any idea what downpipe will work with the t-25 on an '89 Si. I could get something custom made, but I was wondering if I could possible get some other downpipe and cut it and reconnect to cat with flex piping and exhaust clamps (sound ghetto???) Anyone have any ideas/insights? Thanks

 

custom only.. specific application wont be able to use a prefab unless it's used from some1 who made the same setup.

 

have you checked out http://www.homemadeturbo.com? i have read everything on that site and i'm sure you can find almost everythign you need