Piston is out,and I finally ran the car....throttle response is so much betterAnd the sound,oh the sound......perfect little 2-stroke "tink tink tink' metal pipe sound.I didn't run it long,something was interfering with my signal so I left but it never shifted into 2nd.It usually takes a minute to warm up and start shifting anyway but I may have lost backpressure enough to make it shift.I'm goin back out in awhile and I'll get a better chance to read temps and see if it shifts but so far.....its alot better.