You're going to LOVE the SLP's! I put mine on last month. The only thing to remember is the RPM Chart:
Idle to 1500RPM- Low burble, suitable for church going neighborhoods.
1500 to 2500RPM- little loud, turns heads of drivers with windows down.
2500 to 3500RPM- real loud, turns heads of drivers with windows up and stereo cranked.
3500 to 4500RPM- Damn Loud, ladies faint, children run for the hills.
4500 to 5500RPM- What?, Grown men faint, children burst into flame.
5500 to 6500RPM- "Can't hear ya; Ears bleeding", Small Chevrolets burst into flame, Every cop for seven blocks comes to investigate.
Send me an email and I'll try to send you a short vid of mine doing a full throttle flyby.