#17127 - 4 Port Side Exhaust - made by Factory Five.  Purchased new from F5 3 years ago and never used.  I put a coat of black paint on them to inhibit rust as they are shipped uncoated from Factory Five.  Used on MK 1 through MK 4 roadsters and challenge racers.  Cost from Factory Five is $495 plus shipping.  Has one small dime sized shallow ding on one of the pipes (that's how it arrived to me) but it's on the inside surface when mounted and not visible.  (See photo with white background).