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I have the 2.5" nameless axleback (5" mufflers) with the 2.5" catted OP/DP with helmholtz resonator. It is absolutely perfect this way. If you plan on getting a header, go with this option. It is already quite loud without a header.
Do not say that you don't want a cat and a resonator just because you can. These two items are critical to sound level and what you actually get out of the exhaust note.
I believe you should have at least one cat in your system. When you go to a header, it will probably be catless. Having one cat will reduce the raspy exhaust note you get from simply having straight pipes. It will also keep the back of your car clean (going catless will cause for very dirty exhaust gases that will make the back of your car look like ass).
A resonator will eliminate drone. If you go on long road trips or even just a cruise down the highway for an hour, you will want to eliminate drone.
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