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Re: cam and headers
These same manifolds are used on the 638 HP ZR1, so they are probably OK with our 505 + a cam.
That being said, I wouldn't run an agressive cam with the stock exhaust system. Long tubes are better. Why spend the big bucks for a cam install without the headers? It's not like you are maintaining your warranty by keeping the exhaust stock.
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Porsches for breakfast
Ferraris for lunch
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