cams and smaller A/R on the turbine housings. As a trade off, the car will be more responsive. If you want a set of early style TT manual cams, I have a set. Their yours' if you want them, just pay shipping. If interested, just text me. Info in profile. Used, worn out stock manual turbos shouldn't be too hard to find....just swap turbine housings. If you are happy with a little loss in top end and crisper response, just leave the turbos and cams alone.