I'm currently looking at putting a T-28 turbo on my TGP.  Does anybody know where I can get a downpipe for it seeing as how the exhaust areas on the T-28 are the round 3 bolt systems compared to out T-25 almost rectangular systems.

I doubt there are any companies that produce a downpipe like this, because that is not a common upgrade.  However, all you would have to do is get the T28 flange and get it welded to the existing downpipe and it should work fine.  Obviously you will have to make sure it lines up right and everything, but that is probably the only way you are going to be able to do it.

Shawn