Hi folks I'm running 175x50x13 tyres and I'm using a standard t5 with a standard 3:6:1 cossie diff, the car is flat out at about 115mph at 6500rpm.
My question is would a 3:9:1 diff give me longer gears and a better top end or would it be to long and not pull top?
Any other ratios recomended for my set up? It would be nice to use 1st gear as its pretty non usable at the mo.
Also is the atb quaife diff a worth while upgrade?


Cheers andy....