I have never been able to understand this …

Hi there, first post.

I just got a SV650, and I bought a Leo Vince can for it at the same time... just so I could hear that sweet V-twin sound. Only 380 miles on it but great bike so far.

This is my 15th bike over 31 years of riding and after spending obscene amounts of money on generally inferiorly engineered aftermarket parts over the years, I do think it makes the most sense to buy the basics of what you want to begin with... ie the horsepower level, chassis layout, etc.