Changing the manifold is one of the best modifications you can do to your K-swapped Honda. Just with this alone, gains of between 5-10bhp are achievable before mapping. With supporting mods and mapping, gains of between 7-15bhp and a lot more torque are easily achieved. Constructed from premium 304 grade stainless steel our exhaust manifold features the popular 4-2-1 design.Being a 4-2-1 configuration means it gives both excellent mid range and good peak gains. We have done a massive amount of testing with our manifold to make sure it give you the best value for money / power experience.