Hi, I run a 7.5 in the B4 and its super smooth at standard timing and got plenty of top end too, I agree that on astro they run very cool after a competative run, I had mine run in by a friend (before I had used it I must add) at the 2wd regional at blyth/robinhood raceway recently and was faultless all day even though had to play with the gearing as first time out its a big
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