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I have a set of the latest ART pipes, and I went from stock cats. They are louder at WOT but just cruising and idle they're just as quiet as the stock cats, with a little more gurgle (sexy). I don't get any RASP through the entire power band.
I have same car with INVIDIA Gemini..dual..looks very similar to your MD Catback. I've been considering ART pipes, but I've read (0n 370s) that the flex sections, etc are cracking due to stress of unsupported ART pipes!
This is well documented with Gemini set up..but I would think MD set up would be in the same boat.
what's your take on this?
Oh...any CELs or other problems so far?