Besides Livernois Motorsports, the following are the most prominent, well known tuners (in no particular order, or preference) :
Unleashed Tuning (Torrie).
Gearhead Motorsports (Matt).
AJP Turbo (Brad).
I recall fellow owner's having posted other, smaller/lesser known independent vendors that performed tuning for their vehicles over the years, but don't recall immediately off hand those company names.
But suffice to say, the aforementioned one's are the "big four" with product offerings.
Plenty of arguing, debate, and opinion's on each of them.
So please, (to the OP) for the love of God, do your own research and decide for yourself upon scouring through all the posts on each of them, as to whom you will choose.
Last we need here is more rancor on who is best and blah blah blah.
Sent from my SM-N950U using Tapatalk