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Just a guess, but probably because a catted UEL generates less power overall? Which probably means less interest from buyers. Plus I'd imagine most people with catted headers don't get a tune to preserve the warranty/emissions as much as possible. I went with a catless UEL and tune specifically because I wanted to make more use able power.
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Current mods: OFT Stage 2 (w/93 oct), OFH, Perrin Resonated catback, DSS Aluminum Driveshaft, Perrin drop-in filter, Avo silicone inlet, Mishimoto catch can, Grimmspeed MCB, Perrin crank pulley, Nameless overpipe/downpipe combo, DBA slotted rotors, Ferrodo brake pads, goodrich SS brake lines, DOT5 synthetic brake fluid.
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