agree.. those hybrid 4-2-1 header is actually 4-2-1 custom with extended length.. usually u have to go for good tuner shop.. like powerzone.. coz they hav R&D in-house which if you want diffferent powerband they can consult u on picking up the right length and stuff, and i think the header they r selling is quite good which is a wider powerband then normal 4-2-1 header.. coz if u go to any "pakar exhaust" shop they just put some 4-2-1 header and said u have to change diameter of whole exhaust system (usually using "pipe putih" cheapest piping) and say to change to big size s-flow muffler that they convince u it have good sound..

My steering have the same symtoms, well i'm still serching for leather wrapping service in my region.