I've done a bunch of research, lot's of videos, product reviews, pros/cons - etc. Still can't decide between the 2.25" Readylift vs. the 6112/5160 combo.
2021 Powerboost, Lariat w/FX4. Use case = primarily mall crawler, town and highway with occasional offroad, but fairly benign for the most...
FWIW, I'm a little late to this post, but was having the SAME issue. Problem is that ID stock tailpipe is 3.0". The OD is 3 1/8" (3.125"). Note: this is on my 2021 Powerboost. Therefore, most 3" exhaust tips make a great Butt Joint, but NOT a slip joint. For example, the Flowmaster is...