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      02-21-2021, 10:12 PM   #4
AnotherM
Cole
United_States
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Drives: 2016 m5 CP
Join Date: Oct 2020
Location: AZ

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Yes, your 550i would benefit from the same power mods.

If I were you, I would look into BMS stage 1. It is a piggyback tune that can be removed in 10min if you need to smog your car. The downpipes would be great if you can pass visual with them and I would think you would as long as the heat shields are put on after install.

In Arizona, we have very laxed smog restrictions so you can pretty much get away with any mod that doesn't cause a CEL. I am not familiar with your current restrictions as I moved 4 years ago.

Like I said, it sounds like you should look into BMS stage 1 tune to start with.
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