I got the Infinity 6 a couple months ago and I'm N/A with exhaust and a Berk HFC. Here are my results. I picked up 10 hp throughout most of the rev range. I haven't considered the E85 kit yet though. I'm inclined to believe there's a bit more to gain because the VE tables my tuner made are pretty conservative and I'm looking for someone who can maybe do an e-tune.