These sound, and look great. It was an easy choice to get this directly from SLP (Street Legal Performance) for way less than other outlets. When I ordered, my email confirmation came from Roush: Roush and SLP are both part of the Covington Performance Holdings Group - want to know why these bear so much resemblance to the Roush cans? They ARE Roush cans. When the resonator is left in place, the sound is stock-ish in volume, but with more mids and bass.