I would have to ask the customer or installer but I think I would have heard something if any function was lost. Shifting the console an inch gave nice clearance is all I heard.
I like the E series but I love these 6.5 that are available thru a local supplier. The brand is newish but solid imo. Overbuilt and underrated. I talk smack to him constantly about his 8's. 8" subs seem to find a way into underseat enclosures and these things can be a challenge to fit... lol
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The 6.5" subs are like 5.5" depth iirc and very beefy too.