you should use 1 thread for all your questions...was already answered in your engine thread. I like the Novarossi EFRA 2630 pipe and the Novarossi Conical 6fin header. It's expensive, but performance is stellar for me.
Kyosho V-One RRR - JP Modified Mugen X12 - GQ Racing Tires - Futaba servos - KO Helios w/Spektrum Pro - Maxy's Fuel
Losi 8ight 2.0 RTR for fun times