"BUT one point not emphasized by all of the posts on this subject of tuning a 997TT is that with stock components, the VTG's in the 997TT are relatively CLOSER to their functional maximal potential versus the K16's and 24's on the 996TT, since the VTG's are tuned stock closer to their "safe" maximal boost (1.2 with OB versus ?1.4 or so), and already have a steep torque curve with peak torque achieved quickly and early (the rationale behind the adjustable impeller angle of the VTG). So I'm not surprised early tuner cars are not dramatically faster than stock".



TurboAl, can you please share where you got your information regarding the VTG already closer to maximum output? My protomotive TT without exhaust and with stock turbos boosting 1.2 bars, gained about 60-80 whp and will gain 20 more with an exhaust as dynoed by other members. I don't think the stock VTG are anywhere near maximum performance within factory peak boost (1.2 bar).
I may be wrong, but my car is telling a different story .