IMO unless you can measurably improve the performance of aftermarket heads (as in substantially increase low and mid-lift flow) without hurting velocity in the port its not worth the extra bucks to port them (provided they meet the airlfow capacity of the engine).
Almost the same with GT40P heads, they are top notch from the factory and if your gonna dump bucks into them for porting, might as well step up to an aftermarket head.
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2002 5M GT (99% stock)
1991 5M LX (30% stock)
patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker
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