Hi you can get exhaust rechromed and it doesn't make the exhaust rot, you would probably have to take the baffles out,
do you have anyone that does rechroming near you? i'm not sure were you are as it doesn't say in your profile?, you could have aword with them?,
you may find that a lot of chromers won't do exhausts as it dirtys there tanks, i know of a chromer that does do exhausts,
myelf and some mates own Suzuki GT750 Kettles, 2 strokes with dirty oily exhausts well this fella rechromes these sort of exhausts no problem,
Bob Cooper
Chrome Restoration Services,
38 Coronation Road,
Stafford ST16 3JR
Tel 01785-212878 or 02476-364004, ;)cheers Mick.