Has anyone ever used a racing fuel additive in there car?

http://www.4unique.com/fuel/fuel_treatments.htm#LS-130

 

Ive never used any of that stuff. But I have used VP C-16 on my turbo MR2. The car was able to run more boost at a safer level than with using the "premium" 91 octane we have here in cali. I put out an additional 23hp on the dyno after adding the gas, but then again that was combined with some fine tuning on the car. I didnt have the chance to dyno it with regular gas vs. racing fuel. The only bad thing about the C-16 is that it will blow out your O2 sensors after continuous use and I hear your cats too. So its only recommended for track use.