How to make your engine sound more like a boxer?

[harryrcb]

Hi guys couldn't help myself after reading your comments on the bikers, I got even with one the other day, we were pulling up to a red light and I had turn left so as I passed him I rapped my throttle and downshifted, Must have scared the *#%& out of him, he cussed me out for the entire duration of the red light. I just snickered
Here is a link to utube on my exhaust sound
http://www.youtube.com/watch?v=78yWX9buGSU
and another
http://www.youtube.com/watch?v=7Rk1gsC_2DU