Pair valve - what's this and is it difficult also how loud are these cans compared to standard. Over here in England the police do not take too kindly to loud cans as they are not legal here...
I had a set of the Yoshi Bolt ons, and they are not much louder than stock. The pair mod isn't that hard, although I had my tuner remove mine. You will need the block off plates though. You won't need to go to a dyno, though I just had a full Yosh system and a custom map and it's as smooth as silk!!
It will most definetely backfire. I have the RS3 full race exhaust and when rolling off the throttle, a back fire sometimes occurred. I removed the PAIR and the backfiring went away and the bike runs smoother...
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