Here is a copy of a letter I sent to a large circulation bike mag.
How about doing an article on 2 into 1 exhaust systems, there has to be about 15 companies that produce these systems, such as Bassani, Thunder Headers, Super Trapp Super Megs, Super Trapp Kerkers, and RB Racing LSR Pro Stock system, just to mention a few. The smoke and mirrors, pertaining to the gain of 2 into 1 system, over other dual exhaust systems, is absolutely astonishing. Every manufacturer claims more horsepower and Torque, then the next guy. Confusion has reigned over the real story of power gains for 2 into 1 systems, when compared to one another, has lead to complete confusion as to which system will give you the most bang for the buck. Some have tunable baffles, and or disks, some do not, but in any case the should all be tested on the same bike. The idea bike would be something like a Harley Davidson with the TC88 engine, stock or Stage 1 or 2. THE IMPORTANT THING IS THAT ALL TESTS ARE ON THE SAME BIKE. I would like to see once and for all, the REAL DYNO, results from the different systems. With the EFI engines, of today, you can no longer throw on a set of pipes and tune the carburetor. With today