Depends a lot on what you value most and how much you want to spend:
1. MPPSK - stays within warranty, new tune, nice exhaust, about $3k
2. Combination of tune, exhaust, downpipe, other bolt-ons (e.g., midpipe, intake) - allows for a lot more power, different exhaust note, more customizable, potentially cheaper (as in tune, dp, catback plus for $3k), doesn't stay within warranty
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