Trying for 2 birds with one stone here.

Firstly, has anyone tried Touratech products on an XTX?
http://www.touratech.de/Shop_uk/en-us/dept_524.html

I know they had a strong following with BMW owners, not sure if they're worth the delivery wait for Yamaha add-ons?

Secondly, what's the small hole for that's drilled on the underside of each OEM end can, just by the small triangular heat shield? Seems strange to have exhaust gases "leaking" on purpose - noise / emissions regs maybe?

Thanks!

Fatty