ok i got a trx 2.5 in my nitro rustler and it works just fine with the stock pipe at cold or hot temp, but when i put a new chrome TSAIS tuned pipe the only thing that changes is the low end and then after the engine heats up to normal temp it seems to like stall or something when i let off the throttle. and during take off its slower than when it was cold...[:@] what could the problem be? i noticed the backpressure was more when i blew thru the stock pipe and on the new pipe air moves more freely? would not enough back pressure cause this? please help, and thank you for all the help in advance!!