AC on mine and they can drone but I think that is mostly due to the NISMO exhaust. Replacing the muffler soon so that should fix it. I had my drivers side crack a weld at the collector but we are fairly certain it was due to us making the custom downtube on that side to short so a lot of strain on the header itself.
If it were me Jason they are so close I would by the cheaper of the two.
Bothe front/upper cats went bad, replaced them with the thorley and the rest is stock. I love em, just give a raspy edge to the rest of the stock system
I plan on getting some after tax season. My stock manifolds are cracked really bad on both sides. Been in the process of finding somebody that will inspect afterwords since they do a visual inspection for cats here. If I cant find somebody to inspect it I will have to go back with stock crap, and I hate to spend good money on stock equipment when there is better stuff just begging to be installed.
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