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A header will give you the most power. EL if you want the most power, UEL if you want the sound/tone. I'd say a drop in filter would be better than a cold air. Cold airs are hard to tune and don't give much more power than a drop in, due to the efficiency of the stock air box location.
Openflash is alright, but if you want big gains go the ecutek route and get it tuned on a dyno. You should see around 25 whp and 25 wtq increase with a header and drop in filter. Any sort of aftermarket header will increase the sound of your car by a lot, so be weary combining a header with a catback. If you do, try get one that is on the quieter end like the Q300.
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