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The perfomane gain including added sound is all in the headers hi flow cat combination and tune
But tune comes wirh a price of voiding powertrain warranty, not the headers / cats
A tune is not 100% mandatory with headers/cats but you could run in to throwing codes which is a pia
There might be very minimal gains with aftermarket cat backs, surely a weight savings and sound maybe a few hp on the dyno but no seat of the pants feel
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Black CIA -Powder Coated Red Air Scoop - Vmax Ported Throttle Body - Ceramic Coated Dynatek Headers - High Flow Cats out thru factory Cat Back - JRE rough idle cam package - Trunion Upgrade - Valve Springs - Hardened Push rods - 3 bolt timing gear - SLP Under drive pully- Washer bottle relo kit - Hurst Short Throw Shifter with updated pin bushing from C5 member NH-SS - IdealG's improved Master Cylinder - GTO Clutch reservoir - L99 Brake Reservoir - Stainless Braided clutch line - wrapped up with a JRE Tune My SS layed down 462 hp on JRE's Superflow Dyno |