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I had CCC cans on my 620 originally (350mm - although they were the race version), and the bike ran really really well with them - no need to adjust the ECU or anything (carbs might be different though), and ran even better after the EFi was set up specifically to them...
SazzaJ bought them for her 620, and loved them, and Rogerg fitted them to his S4 and it ran perfectly and sounded awesome!
Good quality cans (the carbon fibre is very nice, with good laquer), but the fitting kit link-pipes and mounting straps to need a bit of jiggle to get them to fit nicely.
Hope that helps...
xxx
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