As someone who's owned both, here are my opinions and maybe some facts.
1. I don't think the ark DT-S has 3" piping. Last I measured, they both have the same piping diameter, so I don't know what Zoren is talking about.
2. Ark grip is louder than DT-S
3. Ark grip hang's lower than DT-S. If you want to lower your car, get the DT-S. This is the reason I switched. Once I got coils, I was scraping too often. It wasn't so bad without a bunch of weight in the car. But once I loaded it up for track days it was nearly un-drivable (i stuff two full sized rims/tires in the boot, though.)
4. DT-S adjustable tips. I'm not a huge fan because they have bolts coming out of them for the adjustment but that's a subjective thing. Grip is nice and clean.
I think the quality was fine on both. I enjoyed the grip when I had it and was a little disappointed that the DT-S was a little quieter but it fit and worked well on the track so I'm happy. I had them both paired to FI HFCs so they were a little louder than they would be if I had them hooked onto the stock cats. No drone on EITHER exhaust, however, there is a "hiss" on decel, which I don't mind. In fact I kind of like it. This is due to HFCs, but something to consider if you have HFCs is that these exhausts do nothing to prevent a hiss.
I'll try to answer any other questions as they come up.
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35% Hooper Optik | Takeda Attack CAI | F.I. HFC | Hotchkis Sway Bar | Stillen 24row | OS Giken Super Lock LSD | TK Shift Knob | EVO-R Carbon Diffuser
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