Glideshark, Like I said, I spoke to Cary Faas himself, had a problem with the first set of pipes I ordered and he was livid that dealers were saying his pipes are slip ons with no need for a tuner. Even on a stock bike he requires a tuner to be added. Words from his mouth not mine, they are basically an open flow thru design, very little back pressure and will throw off the bikes tune enough to damage the chrome plating on them from running to lean. I have the CFR's with Drago's head pipes and SE254E cam's installed, these pipes are loud! Amazing how much louder they get when you install a cam.
2012 Road Glide Custom Vivid Black named "Becky" with a simple motto "If it came from the factory like that, it doesn't belong on the bike!"