308 Understanding what the engine Names Mean Dry Sump Oiling System Excellent Protection for Any Track or AX Use. TW #1 thru TW #3 Autocross Great . TW #4 & #5 are MEAN SOB’s - not Autocross friendly. Excellent Autocross Power, Power Curve, Drivability & Durability Wet Sump Oiling System “OK” for Road Courses w/Moderate Duration High G Load Corners Mean, Nasty, Pro Level Race Engines with Power Curves from 3000-8000+ Not AX nor “Casual Track Day” friendly Dry Sump Oiling System Excellent Protection for Any Track Engines