trip:
What does a switchable exhaust valve have to do with whether or not the new GT3 engine is suitable for motorsport? Or substantially different from the base 9A1? Maybe I misunderstood your post TB993tt.
Maybe t got this wrong but I don't really follow GT3 stuff that closely (I prefer turbo torque) I thought switchable exhausts on non turbo cars were all about making a bit more noise for aural effect/satisfaction/sensation and nothing to do with increasing the engine performance (unlike in a turbo car where they can really help with back pressure reduction) - but maybe it is on the GT3 to allow it to run at tracks with lower noise levels
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3.9 GT2 2011 make over