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I have the IS exhaust with catless DP's and originally removed my stock secondary cats. Very raspy and this car for whatever reason was worse than my other catless cars as far as smell goes. Horrible to drive. So I was able to squeeze in vibrant resonators AND vibrant race cats. Had to go with the crazy expensive OBD 2 race cat version because they are so much shorter to get them to fit. Good for up to 850 HP. But very pricey. For me worth every penny. Absolutley no smell or rasp, the exaust sounds awesome. Did before and after dyno's and didnt lose any WHP.
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992 C4
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