I was thinking about ordering off road H pypes. I have SLP Loudmouth axle back. I was wondering if anyone has done this combo and how loud is it? I have heard the clip from Brenspeed.com. I was just wanted other personal preference. thanks Bill

And you will have trumpeting (resonation) at 2500 thru 2800 rpm with the SLP system. You may like it, you may not.
But to reiterate, it can sound WICKED, but when it is not sounding like that, it sounds like a loose tin can....Hopefully the h pipe will be better.