What this always boils down to is one simple question: What's your time worth?
You can make anything fit within reason. I purchased the ETS kit and had it installed because it was worth more to me to have time available to work then it was to have time devoted to tearing down my car and installing the kit. And that's with a setup designed specifically for the VR4. If you have the tools, awesome and you can make quick work of a kit. If you don't have the tools, you'll either have to improvise, or buy tools (so now it's a bit more). If you are making a non-kit work, be prepared for custom pipes, weird angles, tap and die sets, etc....
anything can be done, but I've seen far too many people think they are going the easy/less-expensive route only to be shaking their heads months later saying "yeah, I got it in, but if I could do it over again...."
That being said, if you don't need it as a daily and you have the space to work on it, you'll never learn more about your car then by breaking it and putting it back together!
Quoting Yao:
Okay, it's time to do intercooler upgrade. I am looking at 1g VRSF Kit. Just one question, anybody knows if a 1g front bumper mount is similar to vr4? They don't have Gvr4 kit, but I think it might work, no?