Just wondering if anyone has done the ecu update thru speedchip.com ? I read that for around $ 600.00 they reflash or reprogram your comp. for higher rpm and fuel curves. They say that you can gain a 3 mph top end speed but would it be better to do some pump and prop upgrades instead. I was thinking to install this on a 2008 rxp-x that has a riva intake grate and also installed a 2004 factory nozzle, this has helped on top end speed but always looking for more.