the 3.3 is a bad ass stock engine. no need to change the carb or anything else. its cheap and reliable..
now if you want the best, get the OS 18 tz. hauls arse.
i beat the hell out of my 3.3. after 5 gals of punishment , i put it in a rs4. still powerful, easy to tune etc.
i put the 18tz in...