Actually, a friend of mine had one installed on his 91 Integra LS. A week before the install of the tornado he had his car dyno'd and a week later he was having cams and cam gears installed so we went back to the dyno. Before he had the cams and gears were installed he had the dyno run again and the hp did increase by 3hp. I still argue that the increase was caused by the cooler air of the day as it was 9 degrees cooler but he swears by it. Honestly, I wouldn't risk the chance of having a piece of that thing break off and get sucked into my motor, though he never had a problem with it I was always nervous about it.
Well, that's my experience with it. If 3hp is worth the risk of breaking a $2,500 motor then by all means go out and pick one up.
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