My Spitfire has Monza dual exhaust with no real mufflers (just some bullet shaped things near the exhaust tips). Frankly it's too loud for me. Does anyone know if it's possible to add after-market mufflers to the Monza dual exhaust? I like the look of the Monza's and the sound is cool until you have to listen to it for any length of time. I'd like to soften it a bit. Any suggestions?