I agree completely, don't get me wrong. I would absolutely love to have an upgraded intercooler, it gets hot and humid as shit here in the summer and he car definitely makes more power, back to back, with one.
For day to day stuff with short bursts here and there? Not necessary, especially with some e30 in the tank. If you want to squeeze every ponyounce, every time, go for it, it's certainly hurting nothing but your wallet. But for that short, one or two gear hit to get past someone driving super slow/passing, or a playful stoplight to stoplight burst, it doesn't matter.... at least on the stock turbo. Bigger turbo, absolutely go bigger IC.
For day to day stuff with short bursts here and there? Not necessary, especially with some e30 in the tank. If you want to squeeze every ponyounce, every time, go for it, it's certainly hurting nothing but your wallet. But for that short, one or two gear hit to get past someone driving super slow/passing, or a playful stoplight to stoplight burst, it doesn't matter.... at least on the stock turbo. Bigger turbo, absolutely go bigger IC.