I was planning on keeping the original cans for getting the bike through the MOT. That appears to be the only thing our local tester checks! Oh and every time he reckons the bike needs a new chain regardless of if it has just been fitted. Seems to say the same thing every year.
Once (on an older bike) he said the disks were looking worn, and may need new ones. BUT the bike was fitted with DRUM brakes!
My cans have cataylitic conveters in them anyway, and i doubt if that does much for the power output.
Sorry i cant be of help.
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