i have both header by the way, they also are dc sports. either one of them is going on my jdm b16a. i was wondering which is best for daily driver and power wise out of them two headers.

 

if you only got basic bolt ons and a stock ecu i would go for 4-2-1 header, they make more torque, but if you are going with a higher rev and stronger cam set and top end go with the 4-1 but with 2.5 inch collector. good luck!

 

deffinatly a 2.5 in collector