Got them in mine, never had a issue. However I am going to probably remove them when i do a bodylift. Which will probably be this summer. My jeep performs pretty solid, not much flex though, don't know if the coil spacers contribute to that or maybe its just because i never un hooked my sway bar links yet.
To the OP, what size tires? It's best to lift to fit so you keep a good low cog. I'm doubting you need 6 inches of lift for the tire size you are planning on running, unless you do alot of mud bogging and need height to clear the depth.
Alot of folks misunderstand the concept of BB spacers (budget boost spacers). By themselves, on top of factory coil springs, they provide a simple and cheap 2" lift that requires very little other parts/modifications but if you toss them on top of lift springs then you end up with some steep angles in the suspension/steering/drivetrain, which results in a whole bunch of other mods required.
Best to save $$ and get a set of clearance fenders. You'll be much more happy with that setup.
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