All TURBO regals of 86 and 87 were intercooled. There were those regular buicks of the 5.0 and 3.8 NA decent in those years!!! Yes, there were non-turbo buicks in the 80's. lol. but herb and Bat are correct. My first dream car was the GNX, and man did I have a lot of info on 87 buicks, especially after owning an 87 regal limited 3.8 (SLOW). I wanted to know everything about those cars so I bought as many books as I could find, and any literature from that period. Need a price guide? lol. Enjoy!
John