I’ll clarify the mapping questions with Ollie and feedback.
When I last discussed with him via email, we kinda concluded that the factory mapping set up for open pipes should be ideal for his open pipes too.
What difference the baffle makes to mapping I don’t know, but have asked. It was of no concern to me as I only want the baffle to pass track day noise tests!
BritTwit, check out the web site and look at the design of the short megas... and note that he also does a Y piece to use one of these same megas as a 2:1 system with the mega exiting on the right or the left... you get to choose.
I have enquired about also buying a Y piece and about the mapping requirements of the 2:1 system. The 2:1 system with this short mega will look MUCH better than the factories Street system and it keeps stock footrests which I suspect is better for comfort.