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You are on the right track with the Mouth piece mod. As far as an air intake I would go with S&B they are not real expensive. I would move it down on the list though. Your stock air box is capeable of handling 500hp easily. EFI is a little more expensive but, you can get a custom towing tune for it that will lower your EGTs and throw in a turbo brake upon decel. Most vendors will toss in two free tunes with the purchase of it. I would certainly install a set of Boost and Pyro gauges for towing. As far as the exhaust I would just go with a MBRP or Diamond eye .They are generally under 300 bucks and work well.
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