MAC 4-into-1 Exhaust for XJ550R

If I bought these:
MAC 4-into-1 Exhaust for XJ550R
Would I have to rejet?
If so, what would be recommended?
Anything else I'd need to tweak?

 

bump

 

No need to tweak, unless you have a more free flowing intake than stock. The Mac system flows about the same as the stock exhaust. In act, I noticed almost no difference in overall power between the mac system and the stock Radian exhaust I put on my Seca. There may have beena bit more top end but how often do you ride at 9000 rpm's? When i did the Kerker it neededabit of tweaking on the mid range needle and main jets as well as opening the idle screws another turn. The Kerker made excellent power, and is one fo the few aftermarket exhausts that does so. cruzerjd

 

Hey Cruzer how bout that bracket?

 

Thanks Cruzer