Originally Posted by M3-SRT8
Ah...Did some more research on aftermarket 4-4 exhaust on the cb1100, and I found out the "third" version of the Endurance pipes are actually made by a company called R'S Gear. Japanese made.
They are claiming some significant HP and Torque improvements, across all RPM's. HP goes from 77 (stock) to an even 90.
I think they are the best sounding of the 4-4 pipes, based on limited sound recordings via YouTube. I think they also look slightly better than the Endurance Hi-Power Fours:
They are also more (ooof!) expensive...
Def the best sounding. And adding 12hp is nothing to sneeze at. But WHEW! 27% of the price of the bike