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Check Infinitiusa.com for a picture of the "sport muffler" they sell for $789. That picture does not look like the hardware in the e-bay ad, or am I missing something? The picture looks like a single muffler with an exhaust pipe coming out of each side of the muffler. I guess that the after market units are closer to the e-bay picture.
OP, where are you located? If nothing has changed between the years I have a megan racing axel back you may be interested in. Check it out online and let me know