When I had the phase 1 package done my ss still had the stock LS1 cam and exhaust manifolds and cats from the factory and it still made a big difference and sounded really nice.They can also make it so you can use your center mount exhaust tips also.I wouldnt hesitate to buy one if I didnt have it.GMMG made over 600 cars AND 600HP 427 cars.
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67Z/28,67RSZ/28,71 SS LS5 CHEVELLE,
Last edited by 69RSZ; 08-09-2008 at 07:49 AM.
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