SPOILER: Long story short, I highly recommend the Ark Grip.
I can't speak on the CNT, but I can say that I love my Grip. I did however get a crazy deal on it, brand new and shipped during Black Friday weekend '13. I had to settle for burnt tips, and was a little concerned with the fitment, but I've actually grown to love the burnt tips, and the fitment is truly as good as it gets.
The fitment can be a bit tricky, but you can get the cans and tips to sit perfect with a little effort. I originally thought the exhaust was hitting the crossmember but it ended up being a broken baffle in the gas tank that I was hearing. Drove me nuts as I literally loosened and tightened the exhaust over and over trying to get the noise to go away every weekend for months. The baffle eventually broke a sensor or switch (can't remember the exact issue, I just know it was under warranty) and my fuel gauge was reading empty on a full tank. The Nissan dealer had to remove and reinstall the exhaust. If they can make it sit perfect, anyone can.
I already had R2C's installed when I got the Ark, so I've actually never heard it solo in person. I can tell you that this setup sounds absolutely amazing and I get compliments on the soundtrack a few times a week.
Oh and I just ordered non-res test pipes through Tony at FI earlier tonight. She already sounds amazing, so I can't even imagine once the new pipes are installed in the middle of this setup.
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