The supercharger kit from Alpine is engineered to provide up to 5 pounds of boost. Most of the time, due to it's tricky bypass valve, it runs in vacuum and it only "comes on the boost" under 3/4 to full throttle. Even though it's setup for 5 pounds, I don't think I've ever seen mine get over 4.5 lbs or so.

The main need for an intercooler arises from the temperature increase that occurs when the air is compressed by the blower. The amount of temperature increase from the hot turbo "thermal transfer" is negligible, since the air is moving pretty fast through the turbine. The increased heat of the compressed charge only becomes detrimental and in need of an intercooler on systems that generate over 8-10 pounds of boost.

Due to the design of the Alpine system, drivability both on and off road is not compromised one bit. After taking my truck out on the trail this past weekend, I can truthfully say that the the operation of the supercharger is transparent and didn't adversely effect the VX's performance off road at all. Most of the time the blower wasn't even working, being that most off road driving takes place just off idle. I think the only time I ran it into positive boost was after the trail, when I got to the graded dirt road back to the highway. There I punched it, and had some fun

I don't understand why anyone would want to try to create a turbo setup for the VehiCROSS, when there is a perfectly good S/C kit already specifically engineered for it. Other than just to say that they did it.

Just my 2 cents...

Kirk