Sup honda-tech,
Just wanted to get some advice on muffler piping. I bought an OBX evo style muffler for my 03 civic DX, just wanted to know what size piping should i get? 2",1.75"?? or what is best? i have installed KAMIKAZE headers already...just want good advice

 

i'd say 2.25" if u want to upgrade, if not stick with oem piping

 

If you already have the header and are planning on getting cat-back exhaust I would say go with 2" or 2.25" but also a downpipe...did the new header come with the cat right under it...cuz the DX and LX have the cat right by the header..and the EX it is farther down...