Don't over think it.....
there alot of internet exsperts out there..

I use IRC 4mm thick tubes... they keep the air in & don't puncher easly..
( IX Heavy )
http://www.motomox.co.nz/shop/show_s...t.php?prod=171






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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...