I had a 4 point roll bar in my Duster but it didn't have down tubes so it wasn't legal for 10.99 or quicker. Around here the tracks will bounce you if you aren't legal. A four point bar will stiffen up the car but it also blocks off the back seat. I wouldn't want a set of down tubes in a street car that I drove on a regular basis since it is a hassle to get in and out. Maybe some swing out bars or bolt in bars for the track day would work for you. It is really just a question of priorities.