I have a full ti arrow system , it's very LOUD without the baffle. Can's about 300mm long, but i bought it cuz the system was uber light.
First time I ran it earlier last year it blew 103db at Rockingham (104db limit) and 104db at Cadwell (105db limit) with baffle. I tried it without baffle at Cadwell too and it failed miserably, something like 109/110 or so.
The standard baffle is a bit noddy.
I did a couple of loud days at Donington and took the baffle out, me old man said there was me and Gino Rea on a Moto2 bike that were the loudest out there.
I wanted to do a day at Silverstone, but there was no way it was going to pass the 105db static at 3/4 max engine speed even with baffle, nor the drive by, I can't remember the limit on that one tho' - 102db?
Just bunging the can up with more wadding and/or restricting the flow with smaller orafice is just going to stifle POWER and ruin your day....
I made a baffle from a section of perforated tube I bought off ebay for about £7. Cut a section from it, cut 2 slits in either side a few tens of mm apart, then bashed them in with a ball peen to form scoops to catch the gas. I held the tube in a vice with soft jaws and supported underneath. The intention is to capture part of each gas pulse and separate it so that part of the pulse is marginally delayed on its way to exit the can as it now has to negotiate the perforations. That way each pulse doesn't exit it one large bang.......
I drilled 2 holes top and bottom of the rear of the standard baffle and lock wired the tube to the baffle. I'm sure it rattles a bit but it's a track only bike, so I'm not too fussed. You could bolt it to the baffle but I wanted to be able to remove quickly if I needed to.
Result was blasting past the noise name on the start/finish straight all day and not a hint of the can the can being offensive. It's done a couple of days there now and I've had no problems whatsoever, and all it cost me was a couple of quid for the tube.
Tried to upload a few pics from flickr but not having any joy judging by preview post, here's one in case it works.
Ta
