4th gen (Gen, dammit.. a mark is intra-generational change) is just like a 3rd gen is just like a 2nd gen (Ok.. without a turbo) is a 1st gen (Ok.. without the great suspension and interior).
What they gain in power they make up for immediately in blubber. If you get the chance to line up a couple NAs, you'll find they do the same exact thing at the same exact moments.