- equal length long tube headers with motorsports merge collector. - 200 cell hd German hjs tri metal sport cats. - primary diameter 50mm outer , 47mm inner for the larger 3.8l displacement. - t316 lightweight stainless steel. - reduces thermal stress on the motor. - made in Germany by m&m exhaust gmbh. Please add 2 engine to header gaskets when ordering - 2 qty 997 111 107 31 power: - 981 GT4 / spyder (3.8l) = + 18 crank hp (13kw) & 16 crank torque ( 21 nm) our latest development for the 981 is aimed at those who are looking for more torque in the mid-range, a rich, deep exhaust growl. These headers contain the latest hjs cats, they are nicknamed hd for high durability matrix design catalytic converters. They have a sm-matrix (winding of three flat and corrugated foils) and a special connection to the matrix sheath, which equates to extremely high durability for track and street use. Software is recommended. Want more detailed information on how our headers are unparalleled in the aftermarket? Simply open up our additional .pdf file.

This item may need to be sourced from Germany and would take 2-4 weeks to arrive. Once ordered it cannot be canceled. Please call to check stock or request expedited shipping.