Begging and pleading with companies is not how you get things done.
Find 10 people who want Ark to build a cat-back for the car and willing to put up money, which will finance the R&D, making of jigs and welding
Plus Ark will need a car for test fitting, do you really expect them to go out and buy a Forte GT just for that?
I have a connection with Thermal R&D Exhaust a long time leader in high performance exhaust systems. I know the owner personally.
If you want an exhaust for the Forte GT. I can let him borrow my car to see what's possible and he'll give me an estimate of the cost of ten (or however many) units needed to be made to justify the investment.
Waiting for manufacturers to do it will have you waiting on the sidelines. The reason why Sxth and others make intercoolers because they know you are likely to buy one and even fudge data to show you how effective one would be.
The truth is, you don't need either. You don't need exhaust, just remove the stock muffler if you want it louder.