Unreal. Since I had no info on this car when I bought it in terms of mods done to it, I had emailed Vortech about the SC that was on it and if they could give me any info. Yes, they could and did. Turns out that the serial # on my SC is a V1 S-trim meant for a 2V engine...... Obviously I have a 4V. Vortech dude said that as long as the pulley was not a small one that it should be fine and that the units themselves are essentially interchangeable, it is more the brackets and ducting that would be a problem. Since it is mounted properly I am good there. Only other issue is that he mentioned the 4V units came with a charge cooler, so since mine does not have that I would have slightly reduced power from the 4V unit, provided the pulley is the correct size. The thing definitely is functioning properly. It has the whine and after driving several stock Cobra's in my quest to get one, this one certainly has way more power than stock. I suppose as the weather changes I will yank the SC and find out what pulley I am running on there and either swap it out for a bigger one and a tune, or just retune it to something that I would at least know. IDK. I would never put a 2V SC on a 4V personally but now that I am stuck like that I suppose it really is not an issue depending on pulley. Balls. TLR - 2V SC on 4V is ok but is pulley, bracket and ducting dependent with slight reduction in power.