Thanks all for your help, yeah if i put it back to 200mm spec its around 1700grams now but the bigger tyres and body etc make it up around 1850. I've got the same pipe and manifold as the fast cars. my main problem is the last section of the track is all short low speed corners, everyone else is accelersting hard through this section but i cant do so as the back end always steps out so gotta go gently. Im hoping that if i tighten up my clutch nut or go to the hard spring rather than the medium (its an xray xca high dynamic) it might help, also ive got a rear diff with lighter oil ready to try aswell. Car is good on the straight and its quite good on the fast bends too. Im not expecting to be as fsst as the fsstest guys but id like to get a bit closer lol