Ok, I am going to try my best to answer this as I have done a few similar set ups.
1. the setup you have is extremely loud I ran it and it felt like it was going to rattle my hatch off in the 2.6k rpm area. The resonators do little to no help.
2. The magnaflow bullets will not kill the sound much at all. It will probably make it slightly deeper, but it will still be loud as HELL.
3. If you but Cats on, it will quiet down a little and you wont loose your gurles or pops. I liked the way straight pipes with cats sounded on my car tbh.
All in all, the setup was still loud, but a little more modest and deeper with the cats on. I have since switched setups, but I hope this helped a little.
BTW all of these setups will yeild very close to the same gains. Even with Test Pipes. PM me if you have any other questions
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