Seller notes

A Modular Exhaust System to Wake Up Your 2005-2006 GTO! Bolt on a LoudMouth® Modular Catalyst-Back Exhaust System on your new 2005-2006 GTO for up to 5 extra horsepower and 5 foot-pounds of torque with the aggressive muscle-car rumble your LS2 deserves. The secret to the system's distinctive sound is a pair of stainless SLP resonators, stamped with our SLP logo. The additional performance comes from the free-flow design and our built-in PowerFlo-X® Crossover system that borrows a power-buildin...

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