First off you better get some triple pipes for that Viper if you even want to start seeing F7's. The stock 118hp with a clutch kit will not cut it when it comes to the pesky Firecat 700. They have about 140hp stock and weigh in at around 475lbs.
get a pin kit from straight line performance to use cat weights a stock rx1 rear helix i will have to check on what springs ive used and what catweights to use gear it down and make sure u get alot of weight transfer for a roll on