Cylinder Bank Puns

My 2008 Cadillac STS is fighting with all its will to not run right. I have already done the time of chains. In the process I switched the coils and cam actuators to see if the problem would switch banks, it did not. Still miss on cylinders 2,4,6. Any guess what to look at next? The cat temps stay within in 50 degrees on each other so I don’t think it’s a plugged exhaust either. Basic Compression test should good compression on all cylinders. One weird thing it does is goes into engine reduced power mode but only at idle. If I rev it a could times it kicks out of engine reduce power mode and drives relatively fine just low power. Any guesses what this could be??? I’ve found a few caddy’s with the 3.6 with the same problem misfires kn all cylinders on one side of the engine but have yet to see anyone who solved it.

I've noticed that looking from the front the left cylinder bank has significantly larger cam phasers than the right bank. On the left side both the intake and exhaust phasers are the same size and the right both intake and exhaust are smaller.

I would understand if the exhaust on both sides was a different size from the intake cams but this isn't the case.

Here is a pic of a wrx core: https://i.redd.it/zlmwnrvdbf461.jpg

Current owners who waffled between the A5 and S5, what are your opinions? Which did you end up with and do you regret it?

We’ve narrowed it down to probably the vvt sylenoid, or cam sensor. Any insight? Was intermittent and got worse over the past day. Am I correct? Or dumb.

I have a 2000 Nissan Sentra L4 1.8L, and I recieved a DTC: P0161 - Oxygen Sensor Heater Circuit Malfunction (BANK 2, SENSOR 2)

Does it originally mean Bank 1 Sensor 2? Because this is confusing me.

I've heard that the reason each bank of cylinders gets its own smaller turbo instead of one big one is because two smaller turbos will spool up faster. (Is it also because you need less PSI on two smaller turbos than one bigger one to get the same power?)

QUESTION 1: Assuming what I've been told is correct, let's say there's a V8 engine and each cylinder bank feeds its own turbo. With the same ultimate power goal, why would four cylinders worth of air spool up a small turbo faster than eight cylinders worth of air would an equivalently big one?

QUESTION 2: Let's say two banks of four cylinders each at WOT take 2 seconds to spool up two small turbos to 15 PSI each. What if instead, the same engine fed both banks into one larger turbo and that turbo's size was chosen solely by the requirement that it also took exactly 2 seconds to spool up to 15 PSI. Which engine would create more power?