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What secondary cats? You're literally replacing two cats with two cats. Mind, I don't actually care if the system is EPA approved -- I use that as more of a proxy for "won't stink and won't throw codes".

Dev car thread, if anyone is interested: Thread 'CT4-V Blackwing w/ARH catted down pipes No CELs' CT4-V - CT4-V Blackwing w/ARH catted down pipes No CELs

Time will tell, I guess. I'll certainly post sound clips when I get mine installed. I'm very wary of no-name aftermarket cats, coming from BMW and seeing them melt into turbos. The crossover might even increase the probability, given the potential for increased pressure differentials/heat gradients.

Stock dps don't have a crossover . . .

I'm down. Dunno if they offer a veterans' discount, but I'm a vet.

'25/6M/Cyber Yellow

Is anyone running these? I plan to go catted, and the build quality on the ARH downpipes looks quite a bit better than the main alternative. I'm curious if anyone has any sound clips or experience tuning with these . . . I'll likely run a mildish tapout tune eventually.

Fresh off the truck! (Won't get to drive it home til tomorrow. The Goat Rodeo wants its last hurrah!)

This thread needs more photos! (Mine forthcoming - *almost* out of the Goat Rodeo.) Anyone tint their Cyber Yellow BW with 3M Crystalline? I'm trying to decide between that and regular degular dark ceramic, whenever the GM gods bless me with delivery.

LA in the 80s must have been a trip. I grew up in Buffalo, NY, floated around for a while, and landed here in 2016. Wish I'd bought a house when I got here 😩 The B58 is an incredible engine. I wish BMW had paired it with a decent manual transmission. The plan was to move on to the S58 when the...

Thanks! I plan on hitting the track not long after I get it, and until then there are plenty of canyons and hills here in smokey Southern California. My last few vehicles have been a 2017 BMW S1000R (still in the garage, but unridden since my son was born), a 2018 BMW 340i 6MT (RIP) and...

Hey, all. After thinking about for a year or so, placing an order for a MY 2024 back in April, lurking here forever, and re-ordering a 2025 in September, it seems my time in the pen is winding down. My 2025 Cyber Yellow 4BW is "in transit" (inshallah). Look forward to finding the limits with y'all.