Vintage exhaust

I'm putting together a Rickman framed '77Z1 Kawasaki to roadrace in the vintage class.The motor has a Wiseco 1075cc kit,10.25:1 compression,with the heads cleaned up and 29mm Mikuni smoothbores.I have headers for it and was wondering if you have a slip-on that would work with it.It'd need some kind of baffling as a couple  of race tracks are doing sound checks(still fairly flexible).I've been racing a '75 Z1 for the last 5 years ,stock except for a 1015cc kit and broke it in pretty much as you suggested and it's still running pretty strong after more than 60 races.

I kinda figured that.On this vintage stuff you make it up as you go.I thought that if I had a pipe that breathed well on a newer 1000cc machine that it might work OK on this motor.I'm hoping to take it to Roebling and Daytona at the end of Feb/Mar.After break-in I'm having it put on a dyno and getting it jetted properly.I've had to make caliper carriers,spacers,rear sets,seat,etc.I'd send a picture,but I'm too computer impaired(or too old,61).I figured if I had a pipe that was close I could make it work.