The dimensions of the bypass are as follows: Intake---4 1/4" in diameter. Exhaust---3 1/4" in diameter. Width at widest point---5". Overall length from the leading forward edge lip to the start of the S/S pipe---12". (The inner portion of the pipe slides about 1" deep into the bypass) This is plenty large enough for the Merc. I just would like to know the optimum placement of the turbine within this bypass for max results. TIA!!! Kevin

P.S. Mike, So the Sabre flew well with the Merc!!!! Good to hear---now I really can't wait to get mine going!!!! I also have an Avonds turbine F-16 on the boards. Another great kit!!! I also received my Super Bandit on Monday. It looks as though I may need another Mercury HP for the Super Bandit. (Or better yet, a Pegasus!!!) Kevin