First time I did Grattan was in 2014, already with the bus stop. And over the years I added adjustable dampers, lowering springs, sway bars, camber plates and I was running semi slics last 2 years. My best time there was in 2018.
This is why I'm curious about M2 lap times at Grattan. I'm sure the 'Stang is faster down the back straigh. I was hitting 137 down the back straight. But I expect the M2 to be faster in the twistiest on the other side of the track.
Such a great track. If you haven't been to Mid Ohio I also highly recommend it. Grattan is the best track in Michigan, but I must say Mid O is better.
Every time you go you will get a bit faster. I think I started around 1:39 in a stock Stang in 2014. Shaved almost 9s over the years. Practice and driver mod makes perfect.
Here is a quick vid from 2018. Put the volume up, I miss the way the Mustang sounded the most: