Depends on what you're looking for...you have to keep in mind what you want to do with your car. Remember that most of these exhausts will make the car much louder and will only provide marginal horsepower gains. If you're planning on going forced induction then you might want to consider something anything similar in design to the HI-Power or buddy club (apexI makes the N1 and i'm sure other companies make similar competitive exhausts). If you want something more bearable in terms of noise, and don't mind sacrificing some top end horsepower, then the SP2 or the RS-R EXMAG are decent choices. They're relatively quiet and they will provide some power gains. Overall, if you only want the maximum amount of power gains stick with the well known companies that make coffee can looking exhausts. If you want a mix of power gain and also something that won't drive you crazy later stick with something a little more conservative. Just remember, an exhaust is a pricey investment and it won't make a HUGE amount of extra power. I'm pretty sure the factory exhaust is pretty free flowing as is, and you'll mostly likely only make anywhere from 2-8 extra horsepower. I would actually say an intake (AEM, DC, K&N, Injen are all proven to make horsepower) might be a better investment because the factory setup is quite restrictive. I've seen dyno gains of 6-7 horsepower at the wheels and they're a bit cheaper than an exhaust. Just be careful of a cold air intake because it is more likely to suck up water from puddles and such. If that gets into your engine...you might as well be ready to buy a new one. A short ram or the AEM V2 are alternatives to a cold air intake...they won't make as much power, but you pretty much don't have to worry about water injestion
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