As you know, I've experienced similar results but wasn't sure what I could attribute to VMax since I had my tuner install one along with headers and dynotune. I had no concerns about doing the DIY but by having my tuner do it, I didn't have to pay a core charge in exchange for no real labor charge.
Just imagine how well it works with another 50 HP and a tune! Today, I did a little road trip on two lane roads posted at 55 mph. I went down as low as 50 in 6th gear (about 1000 rpm) and gradually accelerated cleanly back up to 65. I could not do this in stock trim.
