Ok guys finally starting to mod the sho. It's been driven by my fiance since 5 miles. Now has almost 70k miles. Its a 2012 non pp. Oil changed regular by ford et etc. Now I just ordered a custom tune and 3 bar map from unleashed. I put ngk colder plugs in and gapped at 32 I think around 40k miles. Should I replace them? What other preventive maintenance should I do? I honestly don't know if the trans has ever been serviced or anything else besides oil? Just want to do all I can to prevent any major failures.