KiNK43 Posted June 7, 2012 Share Posted June 7, 2012 i have had both s4c and y21 boxes. they definately improve accelaration a fair bit.me and knight have had rolling 2nd gear races and i can pull away from him at a steady rate.not like race off and leave him for dead but its definately quicker.ive also got ITR flywheel on. 4.4kg i believe Quote Link to comment Share on other sites More sharing options...
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