If I were to get another GP it would be that exact car. Same rims and everything since '06 already had nice interior that 04-05 did not. Unless of course you bought the stuff like me. Like said only run a 3.6 unless you plan on putting a cam or intercooler in. As per exhaust mufflers and crap equals zero net gain as it is sufficient. Headers would be what we all suggest as you can pick up a set relatively cheap. Welcome on board.