I believe they do... there was talk about plugging them, before, but I'm not sold on the idea.
Personally, the FS-DE was disappointing to me when I first got it. Great torque, but a really breathless top-end compared to 2 liter motors I'd had previously... except the 626 FSDE, where the damn thing didn't even want to rev past 5500 rpm (an exaggeration, maybe, but that's how it felt).
Compared to the creamy top-end of an SR20, or even a naturally aspirated 4G63, both of which rev past 7k rpms and have bottom ends that can withstand a nuclear blast, it just isn't impressive.
But that excellent torque means that you won't feel so bad about the top end while you're sitting in traffic, and an engine that doesn't make impressive numbers out of the box often responds very well to modification.. . which the FS-DE does.
I'm really into this one now... kind of inspired by one guy who had his old 626 FSDE (118 bhp, FTW!) balanced, blue-printed, equipped with engine-management and a really cool set of 4AGE individual throttle bodies (drool)... 14 second quarters in a heavy stock-bodied car without high compression... hmmm....
I'm trying to see how far this thing can get with bolt-ons only... no funky compression ratios or anything...
