im sure that ya will find ya will save money on fuel aswell as pass a co test with the correct setting for the car

but im sure it does work in priciple

i got a mate whos got a xr2i engine with a drilled block for the oil return and thats running 17psi,,,,,,,,,,,,,,,,, infact tbh its the longest lasting engine we have seen, it was for a general test at first as hes got the proper engine but it works

but it will go eventually but then when it does hes not bothered as he was only gonna chuck the engine in the bin

now im sure if ya spent cash on th engine the risk aint worth it