As a rule of thumb a larger head pipe diameter would deepen the exhaust note on most motorcycles. A more simple solution that would also help maintain peak performance would be to repack your muffler regularly with a good quality packing material.
Exhaust temperatures on a motorcycle can reach as high as 800f.
Exhaust of an engine is a gas.
exhaust leak
Change your exhaust pipes.
rumbling, go to youtube and search for motorcycle exhaust to get a better idea
Research has shown that a Hayabusa is a motorcycle that is produced by Suzuki. One can purchase these exhaust systems from Amazon, eBay and Motorcycle Superstore.
An Exhaust
when a cop can hear it from the inside of his car
Leak in the exhaust system?
jardine pipes
The Cobra's exhaust is made in the USA and is backed by a lifetime warranty. Their exhaust pipes are made to withstand any type of force you can bring to it.
The average temp. of a motor cycle exhaust pipe is 600*F or 315*C !!