If you've opened up the air box I would assume you have and XTR or X? (If you've drilled out and opened the airbox as per Kev's suggestions on an XTZ you're engine isn't going to last long! )

MTC only do a single can system for the Tenere, as far as I can recall the only options for R/X are the Metal Mule system (which is cheap and of suspect quality) and the Off The Road system (which is more expensive but better quality and gives a choice of off-the-shelf end cans).

http://www.metalmule.com/luggage-sys...exhaust-system

http://www.off-the-road.de/en/XT-660...-e-marked.html

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