Too keep the exhaust gases flowing I Extrude Honed the stock exhaust manifold.

The insides are real smooth.


I wasted my money with this mod. This method provided minimal gains over stock. JBA headers flow much better. It was not until several years later that the proper porting method was devised. The headers on this car were never corrected to the new method. Click here for the recommended correct porting procedure before extrude hone.


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