(Keep checking back for hints until some one gets it.) It is a fiberglass vehicle, rear engined, rear wheel drive. It is an all tube chassis, and has 315 section tires all around. What is it? Also, not a Porsche or Volkswagen. Guess away.

EDIT. 2:30AM Time for a hint. It has fantastic leg room.

EDIT 4:16 AM. It was built in the last five years, though the model is much longer lived than that.

EDIT 7:47 AM. That tube chassis is made almost completely from stainless steel.

EDIT 9:52 AM. The manufacturer name starts with a P.