A TRE is a Timing Retard Eliminator. and all it really does is eliminate the top speed limiter by making the bike think it's in 5th gear even when it's in 6th. You could change to a 43 tooth rear sprocket and you will be alot faster in the quarter mile, if you can keep the front wheel on the ground, but you loose alot of top speed. A stage 1 turbo kit will give you around 240bhp you can get them for anywhere between $3500.00 and 12000.00. I suggest a big bore kit, cams, power commandr, 4 into 1 exhaust and get the crank lightened, or a turbo kit and power commander.