2004 chevy trailblazer with the 4.2 i6 engine. all i have done so far to the engine is k&n intake and removed the resonator, but i plan on removing the cat and geting a muffler and tune for it. i painted the grill all black, i have black american racing trench wheels in 22s and a crappy nite shade job on tail lights. audio sytem i have two digital design 9518s and a mojo 4kw with mb quart mids and highs and a rockford power series 600/4 mid amp