Anti-lag is the thing used by rally cars to keep the turbo spinning in between gear changes and under braking , it is probably illegal because 1 the noise and 2 it fires flames out the exhaust .
If you want anti-lag you will need another ECU that supports it , like MoTeC , gems or pectel etc . It is useless on the raod aprt from scaring tailgaters and old ladies , it also ruins turbos with prolonged use and blows the baffles out of the exhaust , not that I would know I've not got fitted to my car
Big Bear ( with granny scaring capabilites )