Just spoke to him, he's happy with it, fuelling wise he fitted a booster plug anyway. It hasn't rusted,good fit, supplied with hanger and removable baffle. He paid £135 for it.
They all running lean as standard. Fancy pipes can aggravate the problem. Avoid so called free flow air filters use posh petrol and get it Hilltopped ASAP.
The bike has had the Geoff treatment at Hilltop and is smooth and progressive and didn't want to spoil that with an exhaust.
I've ordered one now as not stupid expensive if it doesn't work I'll revert to standard.
Thanks gentlemen
Simmi performance make complete systems for race bikes a s well as "cans" for road bikes - They're hand made. It's a small outfit, not a factory. Superb quality.
I bought my Nitron shockers from Simmi - Great service.