MANY of my friends have TT .46 pro engines and they preform as advertised but they still cost aprox $80.00. I plan to test with a tach but a $49.00 (w/trade) MECOA .46 runs great. I am not convinced that the extra $30.00 is worth it. The tach-o-meter will soon tell. The Tower/GMS muffler definitely improves power.

Oily in Germantown

Francis