LOL, those cats have it good!
Loving your approach to OEM+ look. I am a huge fan of 'sleepers' as these cars are relatively common but most do not rip up the asphalt when the boost kicks in. I used to have goals for OEM+ with my MKIV GTI; there were so many Audi offerings (and R32) that really spruced up the car. It feels like BMW has plenty of those upgrades as well.
Holy shit that video of inside the car. That thing RIPS.
Exhaust sounds fantastic, I do hear the rasp in the first video... but I have similar sounds with my 335is exhaust and catless DPs...
Regarding specifics about the turbos... hmm. I am mostly interested in how the day to day feels with them. I've been bothering Rob with a million emails about impacts on daily driving specifically with how quick boost builds. My 104k+ stock turbos are a little lethargic and I don't know how to compare with any offerings. I don't want to downgrade from current responsiveness.
Is there a way to get a 'feel for responsiveness' through logs? I have a few logs from last weekend, including:
I personally am not looking to drag my car, but I have been impressed with the slips you posted. Getting into big turbo territory! What goes through my head is 'what is the day to day like with turbos targeting so much power?'
I get brought back down to earth with my 'instant spool' expectations after reading:
Other than spool speed and feel on day to day, do you have anything else to share? It seems like you document thoroughly!
You'd be surprised how responsive most twins are down low. Spool to 600whp+ shouldn't be what you're looking at, twins generally have really good time to torque and even down low are going to be pushing positive airflow over singles and making 300-400+ torque. When most people replace their tired twins they generally pick up power nearly everywhere, especially up top. Only notable exceptions are the really large twin setups, and people who actually had properly functioning turbos before the upgrade (rare).