Hi everyone, my name is Arnel. im Kind'a newbee with cars. im hoping you guys can help to have more knowledge about my car. i got a civic SI '03 and i already installed a coldair intake, headers and a cat back system. im not sure whats the next modify will i do? please help me or give me a suggestion. thank you all.

 

turbo

 

or the poor mans turbo, NOS

 

thats what im saving up for...lol

 

A High-Flow cat would be my next move.