In a 2wd/3dr sierra cossie is it worth it to get a Mongoose (not O.E) exhaust or make a custom one? Also after what power should the exhaust manifold be upgraded? (if we're talking 400+ I guess an external waste gate should be used) Talking about a T35 turbo always. New to the Cossie world and trying to learn the engine bit by bit

 

The exhaust manifold is fine for that power, I'm not sure what the limits of the standard exhaust is.

I do wonder if a lot have been upgraded for show rather than go

One thing you would want to do is uprate the intercooler, as the 2WD is small.

Martin