I've been trying to have ABS turned off as its supposedly quicker ( a mate is killing me 1.5-2secs a lap quicker, on 2010 we were equal) but not sure how it works, i slow down enough it locks up, slow down too little....well I don't stop

Any advice?
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold