I loved everything about this car. If I could have kept it I would have, but it was slowly falling apart, such as the vinyl. But certainly something to not complaint about considering it's very sporty design (interior/exterior), terrific dependility, the best fuel mileage (upwards to 48 mpg) I thought it was comfy until I drove my second car, a BMW 5 series. Even though I didn't 'need' my Sunbird, I kept it because of the great gas mileage and total efficiency. It was totally fun to drive when I go it eons ago, and still very fun to drive up til I gave it away.
Dependability, reliability, fuel economy, and still looked great after 17 years.
Kind of late to ask for improvements....but really...nothing. It was truly a great buy in every way. Wish GMC would continue to make decent cars...looks like I lucked out.