Also what exhaust part should you buy to get a nice aggressive sound and improve horsepower.
Starting at the head(s). Exhaust manifold gasket, exhaust manifold, clamps (or welded), 02 sensor, pre converter, catalytic converter, 02 sensor (some cases) pipe, pre muffler baffle (some cases) muffler tail pipe, finisher. Misc hangers throughout. Usually just a muffler will do it to get a different sound. Some people do a cat back system which is piping and muffler(s) and sometimes a connecting pipe from one side to the other in dual exhaust systems. (sometimes called a crossover or X pipe)
