Anybody know where I can buy perforated tube to make a baffle ?

 e-Bay.  This lot have various sizes.

www.ebay.com.au/itm/260916800858

FatRob

muffler shop

I'm fairly sure I've got a 'perforated tube' on my trailbike... really must get around to see if that's whats causing the flat... 
 

 Thanks guys.

 

Found out today that De Filipo Performance Exhaust in Melton (Vic) sells perforated tube in large sizes e.g. 2 !/2"

Cost $25 per meter (for stainless) 

there you go, muffler shop, who would have thought