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Originally Posted by wanna986
"It also resembles the aftermarket tuned exhausts you find on eBay where the extra tubing is welded to the muffler body of a used exhaust and routed directly to the exhaust tip."
I've seen these and have wondered about how "good" they are, whatever that means. I guess I'd be worried about the potential for resonance it might have.
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Hi,
I hear you, that could be a concern. Of course they differ from the XLF optional Sport Exhaust System in that they're passive -
ON all the time.
Whereas the Sport Exhaust System is dynamic and speed-controlled, so you'd likely be above any resonant frequency when they kicked-in.
Since the XLF uses a separate wiring harness, controller, vacuum reservoir(s), associated plumbing, and possibly some DME re-coding, I don't know if it's readily retrofittable. But, one thing's for sure - it wouldn't be cheap...
Happy Motoring!... Jim'99