You see, if you're running nitro in a HT, you are running WAY too hot and your motor will die fast. Polishing ports on a HT is retarded, and these motors aren't super high compression, so using any gas above 89 octane is absurd (89 is lowest where i live).
The proper way to add CCs to a motor is to bore out the cylinder and buy a correctly sized piston + rings. My problem is that I am only 19 and do not have to experience to properly bore out a motor, nor do I have the finances to do so.
I am thinking an exhaust dump is the same as an expansion chamber? Or a boost bottle? I am currently running a diaphragm carb, and I hear the bottle is pointless, and the motor I am using will not accept an expansion chamber happily.