how much HP and Torque over stock??
On its own, maybe 8hp and 8-10lb-ft of torque with high-quality gasoline, your Mustang running perfectly, and whatever else. Really, a cat-back on its own is only going to do so much. However, a cat-back exhaust kit does open the way for future upgrades (like PCM tuning, headers and Mid-pipe kits, Boss Intake Manifolds) to make more power than they otherwise would have with the stock cat-back system.Stage 3 Rewards is our free customer loyalty program. Earn points on every order and redeem for cash off your next purchase.
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