I had Fast Intentions first and then sold it and got myself a TopSpeed.
Reasons why I sold my Fast Intentions:
-Couldnt lower my car more than 1.5 inches without scraping the mufflers.
-Freeway drone (It was a little more bearable with stock cats but still there). Sometimes it made my interior rattle more.
-A bit raspy with HFCs (i had the 12' SS).
Im very happy with my TopSpeed. Good ground clearance, no drone and no rasp