The 20 header works on the 6T just not the 6. My teammate runs the Toro Nero Team with the 9901/20 in his truck and runs awesome. I run the same engine/pipe in my xray 09 spec and it works great. The toro and bonito with the 17.6mm stroke really respond well to the longer system as it allows the pulse to return later allowing better scavaging and the engine will make more all around power with better efficiency. The shorter header with the longer stroke allows the pulse to return too soon and pushes some of the fresh charge back down into the case and some of the burnt gases from the previous cycle back into the chamber causing a lean condition and also higher running temps as the engine starves for fuel. This will also cause irratic tune and lack of low end response.

The Toro Nero/Bonito in stock trim are decent but really come alive with some work. If you are looking for the engine to work it's best in truggy, go with the full race ported versions of either engine. I also have Toro Teams in stock that I can get you with the full race porting which it really responds well to and in my opinion needs the modifications to work well in truggy for less than a stock Bonito. I have both engines available in stock or modified trim if interested. Let me know fellas!