cool thanks for the info I'll try the different header..a little more bottom punch would be nice...and re the speed motors..dunno but we have just one guy in our league with one and its so fast its silly..luckily he can never keep it on the track long enough to win anything....no idea what he's had done to it or what pipe he runs or anything but it has a very distinctive scream just before he disappears over the back of a bank and into the scenery hehe