K11 Exhaust back Box & Middle pipe

OK apart from Janspeed, what back box and/or middle pipe is recommended, can the standard middle pipe be used or does it have to match the back box pipe diameter?


Cheers...


J
 
Cheers mailys62, appreciated mate!!!! also for anyones opinion would be great.. so i know that i get the right one with high recomondation e.t.c.


Cheers

J
 
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