thanx for that. that's not what I been told when I was buying iy and asking questions I was told its very safe on my car as thousands of these get fitted to cars without problems. yeh im reggping the plugs to 0.80. how much is a dyno or anyone good that you know in sydney that can check it or dyno my car I was only going to use the 8psi tune for now untill I get injectors n make sure evrything is ok. how safe is the 8psi tune thanx again guys