Exhaust Header Length                                                  This Header Length chart is just for use with the specified 3W muffler.     Engine Header Length 3W Muffler 3w 24i, 28i, 48iB2, 56iB2 7 - 7.5 inch S 30 3w 42i, 50i, 85ib2, 100i, 112iB4 7 - 7.9 inch M 50 3w 55i, 55Xi, 60i, 70i, 106i, 110iB2F, 120B2, 120iB2, 140iB2 7 - 7.9 inch M 55 / L 70 / L 70K 3w 75i, 80xi, 150iB2F, 157xiB2Fi, 212iB4, 220iB4 7 - 7.5 inch L 80 / L 80K / LV 80 / LV 80K 3w 85xi, 170xi 7 - 7.5 inch L 90 / L 90K / LV 90 / LV 90K 3w 200i / 210xi / 240iB2 / 275xiB2 7.9 - 8.7 inch XL 150 3w 342iB2 / 684iB4 9 - 10.25 inch XXL 180