The 4-2-1 is less free flowing and basically better for torque and lower end power.The 4-1 is much more free flowing and better for higher end power.
For all-around performance, I guess it will all depend on what your going for.
-As for the different kinds of coatings....it doesnt matter, the coatings dont affect the performance. The ceramic coat looks excellent under the hood ,the stainless steel header also looks great under the hood and due to the constant heating and cooling, the header actually changes colors.
**4-2-1 header will give better all round performance because it will reduce pressure drop in the exhaust tract, however the amount of improvement depends on the rest of the engine, the type of cams used, if they have longer dwell angles as in full race cams then a bigger change over a 4-1 header will be seen
* cant change username and i dont even have a FIT *
