I purchased a '06 300 SRT8 to keep the Viper company in the garage when they aren't being driven. The mods on the SRT are 180* thermostat, Bassani cat back exhaust, K&N Typhoon CAI, and a DiabloSport Tuner. The Viper has roller rockers, Random Tech Cats and exhaust, K&N, smooth tubes, 3.55 rear...