MAC Autosport

I had the original build work and tune done by a shop in Dacono, CO. I had a recurring issue with a check engine light (original shop fixed 5 times but always came back on) and stalling at low RPMs. I recently upgraded the clutch, M6 transmission and started going to Bandimere. I decided to get my Pontiac G8 with the LS3 V8 retuned.
Started asking folks that I trust and the forum G8board where in the Denver Metro area I should go. I heard good things about MAC Autosports and stopped in to see them early the week of July 14^th. They took a quick read of the ECU and said that they should be able to improve HP and TQ, get rid of check engine light and the stalling. Got the earliest appt. date available August 6^th.
I was lucky as they had a cancellation and was able to get my tune this Sat. I couldn’t be happier. They fixed all the know issues and I now have a solid 433.58 HP and 393.87 TRQ. Everyone there was very nice. Nick did the tune on my car and took his time to get it right. He showed me the baseline before he made any changes and all of what he was doing during the tune. He made at least 4 pulls on the dyno to get it dialed in and got my G8 to its best with modifications I have on it.
I’m expecting some improved times at the the track!

For my work, I’ve needed to do some dyno testing. I tested trucks at this shop and Dyno Pro in N. Denver, and sadly neither was very good.
This shop, however, was easily the worst.
In addition to being more expensive, the shop had absolutely no respect for my time. The first time I had a test here, I scheduled it for first thing in the morning… and no one was home. The guys either didn’t answer the phone, didn’t open the door, or didn’t show up until 45 minutes AFTER I arrived.
On the second occasion, I visited this shop with a 2 pm appointment and waited the better part of 3 hours for a 15 minute test. While I understand that appointments can’t always be kept, I expected an apology, discount, etc. Nothing.
I can’t speak to the tuning work that this shop does (I hear they’re very good), but I wouldn’t give these people a dollar after being treated so poorly.