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You want catless for your UEL as that will give you the most gains and the rumble you want. Gruppe-s is the best bang for buck for performance and quality.
If you do go catless for the front pipe I highly recommend HKS dual resonated fp, it will kill the nasty sounds while still being free flowing.
In the end your current catback is probably going to be the worst sound problem so there are plenty of stock style quieter but free flowing catbacks out there. Some of the better ones are the Q300, Perrin, and HKS Legamax Premium or Sport
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