00StangV6Coupe said:I think they're twin turbos. My dad said he test drove one once and said they were crazy fast for that time and age. Compared to today, they aren't that good but because of the crazy gas prices of the 70's and the eventual decline in manufacturer backed performance the Grand National was the most powerful car available in the U.S. at one point. There are people who set them up for huge amounts of power. Check Kazaa, there are dyno vids of grand nationals making over 1000 rwhp.
Nope single turbos from the factory. And yes they were crazy fast. Hell get one of those old turbo 6 firebirds which is still the quickest firebird made to date.