got my HP booked in for a dyno session on the 29th of September. It'll have a complete Staintune exhaust system, K&N airfilter and some dodgy oxygen sensor electronica fitted to it. The Staintune made a HUGE difference to power - unbelievable, but the K&N and oxygen jobbies i couldn't feel any power increase. I can switch the sensor things off & on so it will be interesting to see if they do make any difference ( they're meant to trick the ECU into delivering more fuel ). I'm also having the front suspension done on the same day. I'm using these guys...