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I don't think 5-10 HP is going to give you any more noticeable power than what you've already got. UEL + Tune already gives the car the kick/pep that people crave. A bump on top of that is just icing. e85/Flex Fuel is going to be the next contribution you're going to really feel in the butt dyno on NA.
From there, it comes down to how much do you want to spend. Do you just want to invest a little more to close-out the missing bolt-on options? Or do you want spend big bucks to chase the last 5% of what's possible on a reasonable NA set-up (e.g. buying the best/premium components, dyno tune, etc)?
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Uncatted front pipe and Flex Fuel/e85 are probably the most accessible means to add the 10-15 HP you're looking for. Tack on a custom Ecutek remote tune to round up the package. Not the cheapest, but the most obvious and reasonable to max out the engine on NA bolt-ons.
If you want to increase responsiveness, you already know what's coming because you've been there. Lightweight rotating components, chassis reinforcements/stiffer bushings, etc.
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