SRT-QC no matter which system you have , if you have long tube headers, delete cats, It WILL be loud, especially at Wide open throttle.
If you want to delete the cats, X-metal and Venom Performance both have them, and during inspections you can reinstall the stock cats.
the best way to go is get a set of mids from a vendor and have them made with hi flow cats,
completely deleting cats will give you around 20rwhp, but installing hi flow cats you will still get around 12-15rwhp.
Doing this you will also need to get O2 simulators witch the vendors also have.Some have not needed them , just remember you may have to use them, they go in place of the rear O2 sensors so you dont have an ngine light come on.
Most dealers in my area will not even talk about deleting the cats, you will need to check with yours first.
By the way long tube headers are the only way to go, shorty headers are cheaper but also dont give you much performance.
The magnaflow gives you a NASCAR type sound at WOT, and the borla is totally different , also many members have also had problems with the borlas muffler system developing cracks over time, just keep that in mind also.
x-metal has the magnaflow on sale for $468 or close, shipped.
Gary at x-metal is in California right now so it may be a week before he returns to the shop.
hope this long bunch o words help