You should listen to me. No, seriously, listen to me.
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Re: Yoshimura can
As best I know all the Yosh mufflers except the very rare true race only types have a 2¼"/57 mm inlet I.D. I used a TRC/TRS midpipe to install an R77 on my K6 and it worked so well that I don't understand why Yosh doesn't list the combination. The only issue was that different length springs were needed.
P.S. Except for the band, the Yoshimura exhaust clamps are made of steel that tends to rust badly in exhaust service. Here's one that was reworked with stainless barrels and a titanium screw.