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I installed a (high flow) catted FP and OP prior to my UELs and there was a slight difference in throttle response/pickup...I spend a lot of time cruising in 6th gear and when I needed to pass someone I repeatedly (over the first few days following install) thought I had left it in 5th and not gone up to 6th before setting CC, only to look/feel that I was indeed in 6th gear.
With all of that being said, not sure if you will notice that difference if you already have headers and a tune. I wouldn't think it would be worth the $$ for one of the more expensive OPs. I went the cheap route on my OP/FP and got 2.5" high flow catted FP and OP for under $250 shipped (Ebay - SRS Exhaust). I haven't seen anyone else running them on here, but I was super happy with the quality/fitment and so far they have held up just fine. They have a pretty extensive parts list for DSMs and get good reviews in that world, and those guys can be savage.
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