Want to buy a junk shorty can for my RS125 / CRF150 mini-roadracer. Currently running in excess of 120db, no doubt. Terrible, terrible sound... Painful to all involved; not safe around children at the track. And go figure, the $3 Chinese baffle I smashed into my present configuration was good for enough back pressure to make the bike run like crap. Inlet ID should be in the neighborhood of 45mm, (see photo). Thanks.