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I have AR catless DPs with stock secondary cats and exhaust.
I only noticed a slightly stronger exhaust smell compared to stock. The difference is not very noticeable at all.
I have about 10,000 miles on the car since I installed the catless DPs.
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2008 E90 335i | PROcede Rev 2.5 | PWM Meth | CP-E FMIC + OC | AR catless ceramic DP | BMS DCI | Wavetrac LSD | MORR MonoForged VS8.2 | Michelin PSS
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