Remus is expensive, but sounds good.. some like the sound of a uuc, but i dont think they have an option for your car.. Magnaflow is cheap and will sound great, not like a ricer exhaust, just a deep and full note. On the 5's you dont have fancy tips do you? the stock exaust just curves down in the rear? Something like a magnaflow might work great with that because you wouldnt have to see the tips.