Really well, not that laggy really, according to my secs monitor it's only peaked at 19psi so far but it just spins the wheels in first and second and then grips in 3rd, and pulls really well, like i say, i've only given it half throttle and not revved it past about 5 to 5.5k, just trying to put some miles on the engine before i have it mapped, and to iron out any niggly problems. The engine is really quiet, although the whole car is louder, partly because the fuel pump's in the boot lol.