hey mate 3.9 are good for doing burnouts with the raptor kits,. except 1st gear is shorted to 40-45km/h and second is around 100.
for an exhaust a nice set of extractors, high flow 3 inch cat, with straight thru after that or try some hot dog mufflers?
with the trains a set of kevlar bands and some covertte or billet servos, and a stage 2 would be sweet shifts like a dream,
hope that helps


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