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I don't reccomend the double DME method for a multitude of reasons including over complication, it not being as easy as plug-n-play with the keys and immobilizer rolling code, and overall excessive sunk cost.
If you're concerned about warranty or resale value, the answer is simple: leave the car alone until the warranty is up/ you sell the car/don't do anything you think will negatively affect the value.
I went with the MAD catback because I didn't like how the Dinan catback only has one valve and essentially makes one side a straight pipe leading to disproportionate sound distribution, it also blocks off the far left side tip when the valve is closed so one tip may end up with more or less carbon build up than other tips, which looks less uniform.
The MAD catback has dual valves and distributes the exhaust flow much more evenly.
Ultimately that is a personal preference thing though, if you don't care about those aesthetics there's nothing wrong with the Dinan catback.
I have videos of it, but so far the only way I've found to post them in these forums is to upload to YouTube first, which I don't even have a YouTube account, and seems like a lot of work.
As far as JB4 vs BM3 they're not really comparible as a piggy back vs a flash tune are different, but a JB4 is the much easier way to add increased HP without having to jump through the Femto hoops required with the late 2020+ cars. And as I already said, in terms of tunes my reccomendation and what I went with is MHD.
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