Hi, well i have a Civic ef HB EX with a 1.3 EFi engine swap D13B and i want to change the header so i need some recommendation cause its have the stock header that sound really weird and i was thinking to use a d15b stock header but i saw that my down pipe its really small and i don't want to mess my lil engine power with another header you think i can use the d15b header without any mpg loss or power loss???? my header its the one that come with big catalyst close to the 4 exhaust.
thankss any help..
kakaroto_ss4 
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