I don't have a V8. I have a V6, and yes its american. I have '99 GTP. Not many mods just a K&N intake and filter, and 3.4 supercharger pulley. I havent dynoed it yet, but at the same time I'm waiting til I'm done with it completely. I plan on getting SLP exhaust and headers, new cam, and doing more to the engine. I just want to say all of you have nice cars.