You can still bore the 360 but I don't know how much and that might be tougher to get your 400 hp out of. Sorry,I don't know anything about the trucks or the 4-speeds. I have C6 trannys in my cars, and they are pretty much frag proof. If you have a clear coat on your rims, which most aftermarkerts do these days, the exhaust could ruin them. Not to mention you might be breaking local noise restirctions Some surfing on the net might get you the answers your looking for, and shouldn't you be in school right now?!? Sorry, its the father in me asking