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3-5rw from the porting and more throttle response. But it is a supporting mod for a ported IM. If you are staying with the stock heads and cam then the MSD shows minimal gains if any on the dyno and track and is a ton more money over the ported stock stuff. The ported MSD will close the gap some but in the end will be minimally faster. The ported MSD/95mm TB is even more money than that . The best we have seen with the ported MSD over my ported stock stuff on the track is about 1mph and almost a tenth if the car is set up properly.
If you are an M6 then I can see possibly swaying towards the ported MSD/95mm TB if you are a highway roller.
If you plan on doing H/C at some point then the ported MSD/95mm TB is the hands down winner. No question about it. I am seeing gains of up to 40rw on H/C cars over my ported stock stuff which has shown out on a ton of cars now to be much faster than the stock IM/TB.
Another benefit to the stock ported stuff is it can slide by techs for warranty work.
I port and sell both so I am completely agnostic to which you chose to go with in the end. Just giving you the facts from the hundred or so cars I have done now.
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