FS, I was nervous about buying Pypes because they were less expensive than SLP. I heard the SLP's and really liked the sound and looks but really didn’t want to spend that much so I bought the Pypes "Pype Bombs". Pype Bombs are brand new and have built in resonators. They sound awesome and look beautiful and are a perfect fit. It comes down to what you want to pay and what your preferences are. I will be at CWO's retirement so you can look and listen to mine if you like.