Yeah why bother designing a product that is only questionably better than the OEM design, and severely lacking in any real use aside from saying you have K2 pipes.
For the price, a little time on engine analyser and pipepro will tell you that the 3.0RB on stock cams on high lift needs 1.75inch runners around 5ft long into a 2.25in collector and dual 2.25's all the way to the back in rolled pipe.
I'm sorry but the OEM pipes, and some gimmick japanese snot made for posers are not good. Theyre cheap and nasty and marketed as if theyre gonzo pipes. I'd say anyone willing to spend the money on K2 front pipes should seriously think instead about a proper tuned length split system, balanced somewhere shortly after the 3:1 collectors, and running dual pipes all the way to the bum. Oval pipes for epic nascar cred...
As for cats....you can have as many random bits of 3-5inch stainless with tapers welded onto the outside of a straight pipe as you like for the illusion.