I have done a little research into this and so far have learned the following differences:
1) Intake manifold may be different
2) Cosmetic(Valve cover?)
3) DME programming (overboost etc.)
Are there ANY internal differences that would make one a better choice for a replacement or conversion motor? I also have heard of RS2 motor but advertised power seems to be simaler. Any info would be appreciated. TIA!!
90-91 Coupe (thinking about it)