I was just reading about the Meyers Manx dune buggy, and Bruce Meyers' newest iteration, the Manxter, with a Subaru STI turbo crate engine is capable of sub-four second 0-60. Pretty cool looking, too. There are a couple of places that do turnkey builds, one in Cape Cod and one in SoCal that I'm aware, or you can build it yourself the old school dune buggy way by ordering the fiberglass components from Meyers Manx. Turnkey appears to be from around $35K on up depending upon how fancy you get.
Pretty cool old guy, Bruce Meyers. He's 90 now and still driving his creations all over the country to events to promote the preservation of vintage Manx as well as his new buggies. I met him in 2014 on the OBX of NC, annual event, "Manx On The Banx." Here's a Jay Leno's Garage episode featuring the very first fiberglass dune buggy ever made, a Meyers Manx, he invented them pretty much:
https://youtu.be/PYYPJ-ExM-M
Those externally mounted tanks are from a Baja competition he entered way back, they were for extra fuel.
I have driven lots of buggies and subaru’s but not the new subaru engines.
VW engines were so simple to repair but required regular maintenance.
Early Subaru design was wear it out and throw it away.
Porshe 914 motor worked for me