FMF Offroad Powercore 4 Exhaust Spark Arrestor 041582 exhuasts Rugged rubber boot protects digital 1403 3664 Rugged rubber boot protects digital gauges MX Bend A (Width) B (Height) C (Rise) D (Clamp Area) E (Sweep) F (Control Area) High Washougal 800 99 69 243 54 190 Mid High Unadilla 800 95 67 233 60 190 Mid Redbud 800 92 60 225 57 195 Mid Low Millville 800 82 56 230 57 200 Low Southwick 800 77 40 188 56 230 Mini 730 117 89 166 50 195 The latest version of the Powercore 4 design incorporates a hi flow core which has more surface area to absorb more sound while flowing more exhaust stronger and more powerful than stock exhausts