I added a K&N filter, ZZPerformance intake tube, and ZZPerformance throttle body, and then did the remote tune from ZZPerformance. Its like driving a completely different vehicle. I'm not sure on HP gain, but I wouldn't doubt it gained 20+ hp. All in all, cost about $1000 installing myself.
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ZZPerformance Intake Tube, Throttle Body, & Tune | Mishimoto Catch Can | K&N Filter
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