Hi John,
I can assure you its a noise Db related headache. We ran the cam in outside their factory and they have big fans/blowers on their dyno going at the time.
The option at the moment is double the muffler size and I am talking with the exhaust guys at the moment. The cone insert is an option that will bounce the exhaust gases around into the muffler.
Darren at Di Fillipo is helping with facsimiles to me.
Cheers
Bernie
Bernie
Mt. Gambier South Australia