Just started working on my civic and need some suggestions! Thinking about an AEM V2 Intake, APEXi N1 cat/back, DC Sport Ceramic 4-2-1 Header. I want to boost my horsepower about 20-30 anything would help.

 

uh 1. you posted this same 'question' twice 2. everything you have listed CAN help, but to get anything more than 10-15 hp ur gunna have to start changing the programming in the ECU and maybe looking into re-sleeving ur engine, if not FI

 

those mods could give you close to 20. throw in a high-flow cat and you might get it. a cam would be a great addition. and an intake manifold.