A common problem is that a newly-installed exhaust pipe or slip-on doesn't fit properly which causes the bike to backfire on decelleration. Aftermarket pipes are not a precision fit and often they let in combustion air that, when mixed with unburned fuel, results in the fuel being burned in the muffler. To prevent this, use a high temperature silicon sealant at the joints to keep the air out.
I recommend Permatex Ultra-Copper high temp RTV silicone gasket maker #101BR for the aftermarket slip-on system joints. Good to 700?F intermittent. Available in auto parts stores.
http://www.permatex.com/products/pro...tem_no =81878
Shazaam!
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