if the golf IS worth 5.5k i wouldnt bother.

sell the golf, then see if it is still for sale.

seems like a raw deal if he is giving you that car plus only 1k for a car thats less than 5 years old, bigger, more reliable and refined.

if the only question was is this worth 4k?

then yes, as long as it is an original RS and has NO rust. in 28k rust can set in quite easily, check the restoration as unfortunately, welding accelerates the growth of rust