If you ordered the Kooks system without their cats then that is your issue. As others have said, headers are never the problem it's when people install them with no cats/resonators. If you ordered without cats unfortunately I don't know if there is a way to add them on after the fact. You could also add in resonators to the catback portion and that would probably solve the issue as well.
I actually bought the car with the longtubes, so I never had the cats, I've sourced the stock manifolds, now I just need the stock cats with downpipes. Car still has quiet mode with stock mufflers.
If you bought the car without cats, then how was the following that you posted in your other thread even possible?
That isn't what I was questioning. How could the dealer sell a car without federally mandated emission equipment AND they and Ford sign off saying all is fine?
That's exactly why I did my due diligence upfront to ensure I wasn't being taken for a ride. Seems like a lot of manufacturers are ignoring what's federal vs. State mandate. I'm not questioning it, just trying to get my exhaust back to stock. Not trying to beat a dead horse either.
No doubt about it, it does sound amazing, if you were at a track or running slip stream, but its too loud in loud mode and I'm not a fan of it in quiet mode, I'd like to be able to tone it down under WOT and not have to worry about cops from two towns away chasing me down. Cold start sounds great too, but in my garage the entire house shakes, and my wife just shakes her head.