Have a 2014 Tremor. The only mods as of now performance wise are AFE stage 2 cai, magnaflow catback and MPT 93 perf tune. In the process of datalogging the tune before he sends my 91 perf and 91 tow. I am moving to Florida in August so I'll have access to 93. Here in Arkansas its 91 everywhere so I've been running 6 gallons of 112 race gas in every tank of 91 to ensure I'm at or above 93 octane. The other day the gas light came on and I was down the street from the place I get my race gas so I swung in and got fuel. Ran a couple of errands and topped off with 91. Well, the next day my cel came on p0230 (cat) but no change to driving. Yesterday I got p0220 and 0230 (both cats) but this time I performance was sluggish. I returned to stock and cleared the codes. They haven't returned but I figure its time to toss the downpipes in favor of a new set that will be happy with a little race fuel mix until I get to Florida. So, to cat or not to cat. I am going to order ASAP and request the tune to be altered to reflect the mod. Any experience or advice?