K Series K20 K24 Non Lean Hood Exit 4-1 Megaphone Race Header Civic EG EK DC2 USK Series K20 K24 Non Lean Hood Exit 4 1 Megaphone Race Header Civic EG EK DC2 US K Series hood exit race header (4 1 Megaphone) features a true 4 1 Megaphone merge to create equal exhaust flow. A megaphone is added next, to release pressure and increase the speed of the exiting exhaust gases. A small reverse cone is placed at the very end to provide a tiny bit of wanted back pressure. This header delivers the best peak horsepower gains while utilizing