Mark

You are welcome to try my JHA's on the dyno. They are on my race bike at the moment, so you'll have to come between race meetings.

Having measured them vs my Tyga, they are very similar in chamber sizes, but the JHA's are slightly different on the left pipe (more like the RS racer in that the tail pipes exit the bike at different heights when looking from the rear). I found on my RS, a few mm can have a big effect if it's at the header or the stinger.

Andy Bacon (Abcon) makes pipes to any spec, but it'll cost you £800-1000.

Cheers

Dan