My tahoe use to deactivate some cylinders. I hated it! It would lag on quick acceleration (felt like 1-2 seconds to switch back to full v8) and the exhaust note (I have a tame borla cat back) was horrid.
I removed it with a handheld programmer and the can tune got me 1.5 MPG MORE even with cylinder deactivation off.
Its crap in my book.
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2022 G80 M3 Competition X / 2020 Range Rover Sport P525 / 2023 Ford Raptor
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