BV makes a specific bypass for the P-70 which is a bit longer than the Ram 500 bypass. The diameter is the same, however. I used the Ram 500 bypass/P-70 combination in my BVM F-16 since the longer bypass did not fit as well. The combination works fine and the engine runs cool. I did use BV's P-70 pipe in this application as well. The RAM 500 tailpipe setup has smaller diameter inner and outer pipes than the P-70 setup. and it seemed to be somewhat restrictive. With the P-70 pipe you can trim about 1/4" to 3/8" off of aft end of the bypass. This will open up this area a bit more and allow more air flow for cooling between the inner and outer pipes.

Mike Danchak