Regarding dyno results, I don't think you'll get them. Ark hasn't even provided results for the Stinger yet and it's been available for nearly a year. Same goes for Borla, Thermal, Magnaflow, and any others that have made Stinger catbacks.
The general consensus is catbacks don't provide much in the way of performance for our cars. Kia/Hyundai designed the stock system pretty well (even with the weird bends and crimps it has). The stock catback weighs about 55lbs though, so there is benefit of shedding weight.
The money maker is mid and down-pipes. On the Stinger mid-pipes are adding 30 hp on a dyno. HFC/mid-pipes are good for 50+ hp.
Ultimate Performance and JunBl has made a HFC/mid-pipe combo for the Stinger and SSR makes secondary cat delete/mid-pipes. Someone may want to reach out to them to inquire about potentially getting involved in the G70 market. (they might fit already, someone just has to take one for the team and try it out)
The general consensus is catbacks don't provide much in the way of performance for our cars. Kia/Hyundai designed the stock system pretty well (even with the weird bends and crimps it has). The stock catback weighs about 55lbs though, so there is benefit of shedding weight.
The money maker is mid and down-pipes. On the Stinger mid-pipes are adding 30 hp on a dyno. HFC/mid-pipes are good for 50+ hp.
Ultimate Performance and JunBl has made a HFC/mid-pipe combo for the Stinger and SSR makes secondary cat delete/mid-pipes. Someone may want to reach out to them to inquire about potentially getting involved in the G70 market. (they might fit already, someone just has to take one for the team and try it out)