[99LeCouch]

Ahh, you gutted your airbox? That's a nice, easy mod to do. I've done mine. There's not a big difference in FE. If anything it slows down the air coming into the engine if you took out the back piece. I'm thinking I want to put in a few pieces of Coroplast to redirect air towards the throttle body so the airbox is nice and wide-open in the front, then it tapers down in the back so air isn't stagnating in the corners of the box. I wonder if that would do anything.

The 3800 is a 90* V6, not a 60* like the 3100 and 3400. Changing the exhaust on an H-body like mine and Isaac's doesn't do anything but change the sound. It's mandrel-bent 2.5" stainless the whole way back with big, gentle bends in it. Even guys with the supercharged cars putting out decent power stick with the stock exhaust since the guys who spent $$$ on "freer-flowing" exhausts got zero power increase.