VW Baja, Buggy, Rail or Rod Black With Muffler 1 1/2 Inch Off Road Large Flange Header Exhaust Systems. 1 1/2" Tubing with Large Flange. Header and muffler systems include u-bend. The with heater header is for use with heater boxes or j tubes and has connections for heat risers if needed. The no heater header eliminates heater boxes and has heat riser connections if needed. Fits 1200 - 1600cc upright motors. Includes necessary gaskets. Donut clamp kits sold separately.