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If you gut it, it will throw a 420 cat code. Fix it right. Back pressure on this vehicle is not as critical. Gutting it you wont notice much difference in sound or performance. Make no mistake, on performance applications back pressure IS very important. Rather than running open headers some drag racers switch out tuned extended header collectors to change torque curve and make more power at different rpm ranges. On street cars it's easy to install a larger exhaust than you need and you can actually decrease horsepower.
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