So you built an s13 daily with an SR20 in it. It’s reliable, it’s fast, it makes awesome chu-chu noises, you put 5,000 miles on it, but then you realize that there is one thing this car doesn’t have-4 doors. That is the exact predicament we were in.
We set about on a search for a cheap 4 door chassis that we could swap our power plant in. We originally had our eyes set on an E34 5 series wagon, but were discouraged by the weight. The 3900 lb curb weight would have made the SR feel extremely sluggish. After going to a junkyard to take measurements on a couple of E34’s and realizing that there would be a lot of fitment issues, we abandoned that idea. While there, we also measured a couple of E30’s, and realized that the SR would fit absolutely perfectly. It would clear the subframe, the sway bar, and the shifter hole would align perfectly. Combine that with the fact that a 4 door E30 weighs in at around 2700 lbs, we were set.