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I've heard both. Flowmasters are deeper but Magnaflows are more raspy, personal preference.
As I've mentioned before I have my Flowmaster exhaust setup for sale. Custom bent pipes, custom made brackets, and a high flow cat if you're interested, should fit right in with no mods, just cut off your old cat and one weld to the main pipe should do it.
Let me know if you're interested. But even if you don't go with my setup, you should get a high flow cat if you still have the original, that's where the hps at, not the mufflers.