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Justa a datapoint. I have Agency Power catless (with resonator) downpipes and Velos stage 2+ on X6M. Stock otherwise. The AP are the only pipes I've had on so I can't compare. I like that they have the flex portion. Sound is nice...hardly noticeable under very easy acceleration, a noticeable difference under moderate to heavy power and in M mode it's quite noticeable. It still is a quite ride at cruising speeds. I have zero smell, and no CEL light. Glasspacks on a big Chevy V8 still sound better and are louder IMO but the sound did get a little deeper and "throatier". I'm happy with it as it's comfortable to talk while in cruise with others in the car yet when I want to stomp on it, I get the additional thrill with the sound.
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