Its a lottery when you buy one of these GEN 111, 22% of them (VX to VY series)suffer from piston slap, mine did but since its had its pistons replaced its PERFECT!!!!<br />Now I wonder what warrenty they give you for this did you ring them and talk to them. <br />Don't worry about the HP department just go to www.ls1.com.au <br />and ask them,,, Look on the other side of their avator they have their RWHP (rear wheel HP) on for all to see and most have there dyno charts to prove it too.