Already have HFC's and a Cat-back.
Getting my Stillen Gen 3's delivered today.
I already know I'm getting a tune, but unfortunately the two reputable shops near me won't have weekend availability for about 3 weeks.
My inner car-guy reeeeeally wants to put them on ASAP.
Would it be a wise decision to not install them until the day of getting tuned, or should I be alright driving around for a couple weeks so long as I don't go full hoonigan?
Thanks!
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