I figured I would throw my 2 cents in also. I have to agree with Tone completely. I had my S/C installed at a local Isuzu dealership by their master Isuzu mechanic. The install went very easily, about 5 hours. I have no complaints on the fit and finish at all. We elected to replace the o-rings on the injectors as they do tend to swell. We used a 3M Maroon ScotchBrite hand pad #7447 to smooth out the injector holes in the manifold before installing the injectors you won't cut the o-rings if you do this and it makes them go in a little easier. The only problem we had was there were no instructions on where to mount the throttle/cruise control cable bracket. We did call Alpine (got right through) and spoke to John who told us where it went. My suggestion would be to install it on the back of the S/C manifold BEFORE putting the S/C on the engine. There wasn't much room, but it did go on. The only problem we had was a very slight leak around the crush washer on the banjo fitting feeding the right side fuel rail. A little more tightening and no leak. Since installing the S/C the power increase is very noticible from the moment you put the pedal down to red line. It does come a little stronger in the upper RPM range, but it is noticable from the start. Bottom line.......it IS the best modification you can do to your VX.