Good morning Robert- Yeah, wheels are unsprung and rotational, so if you're looking for the best performance the lighter they are the better. I don't think any amount of weight removal any where else can compensate for heavier rotational weight. And your Speedster sure looks bitchin' with the alloys! What about keeping them on the Speedster since you drive it more? The 912 would see them in the garage every night so he'd know they were close.
Yes, I'm referring to Alan's old project. As I said earlier, with the weight reduction the aluminum sub-frame gave, I would have thought jumping through the hoops to get it SPCN SB100 certified would have been worth it. But that's a whole 'nuther topic...
You were talking about taking the turn down off and adding to the tail pipe to solve the dust and noise problems- have you got to it?
PS- Have you figured out your gas pedal/cable/linkage issue? Are you getting full throttle? I've seen pedal clusters that have dirt/gunk built up and the gas pedal isn't getting full travel.