I'm willing to pay for adjustables, although I would also pay right now for a fixed 132.5mm set. Can you imagine the amount of research that Team Green did to test these? if you want better handling in tight areas, the 132.5mm length has a proven track record that I have no doubt will improve handling. Every picture of a Team Green KX500 that I look at has the Pro Circuit dog bones. They were probably foregone or stripped on the practice bike I bought.
My next sought after mod after these dog bones, is a Team Green modified silencer (oem silencer shortened by 3-inches and a welded sparky at the end). My FMF is a POS in my opinion. Seems so restrictive an quality compared to oem is ridiculous. Leaks well before the packing needs to be changed and this is with a motor that was correctly jetted on a dynomometer.