Jsswcks,

It you want to save yourself a little bit of money, keep the motor you have (I assume it's a 15FE) and buy HPI's stage 2 upgrade kit for $60.00. You get the 5.5 2 needle carb and the ABC piston/sleeve/rod combo. With those upgrades, the 15FE becomes a 15SS and you save $40.00 in the process.

You know, I don't really think that the HPI exchange program is as hot a deal as it appears. You send them your motor and for $100.00, they send you a 15SS. Spend and extra $20.00 or so and you can keep your current motor as a backup and still buy an OS or something like that. Just something you may want to consider.