[pbonsalb]

BIMMERPOST / Classifieds

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CTS Turbo high flow catted primaries for F90 M5. Ran for about 6 months. Wrapped before and after the cat. Happy to remove the wrap if desired. In southern NH. Local pickup preferred. $375

[spacejamm_x5m]

Did it sound different

[pbonsalb]

Yes, you will hear a turbo whistle under low load at low rpm, but just a little bit more than with secondaries only. If you don’t have secondaries yet, try them first. You gain sound and a little power. From there I would go to primaries whether no cats or high flow of power is the priority. If sound is the priority, I would go to a cat back exhaust.

[S EyeLand]

Originally Posted by pbonsalb

Yes, you will hear a turbo whistle under low load at low rpm, but just a little bit more than with secondaries only. If you don’t have secondaries yet, try them first. You gain sound and a little power. From there I would go to primaries whether no cats or high flow of power is the priority. If sound is the priority, I would go to a cat back exhaust.

What about smell as the primary concern? These vs the Mad catless primaries with catless secondaries. Wife is being a pain in the ass i might buy these if it shuts her up.

[pbonsalb]

I did not notice any smell with the 200 cell high flow catted primaries and catless secondaries, but I rarely notice it with catless primaries — has to be stagnant air with the car parked or dropped on traffic. Others are more sensitive.