^^ yes, the S2 has 2 cats built into the primary down tubes, so yes, they do breath better! Y pipe and up-tube are better too. Primary CAT, not so much!
Thus sometimes it pays to go back in time and repeat the past!
This one has that.... S1 bits underneath!
Thus sometimes it pays to go back in time and repeat the past!
This one has that.... S1 bits underneath!