Too many variables to say honestly. However, I would go with the cam change. You're forcing air into the engine while under boost versus trying to suck it in running N/A. Changing how long the valves stay open to compliment the supercharger would be a better route in my mind. That and your stock heads are good to begin with. Porting them later is a solid and easy option that will only compliment the cam more.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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