Cold air intake, I wouldn't bother with one unless you know you're na for life. The oem box is an amazing piece

 

Why is it that every person who comes in here with little to no experience in tuning S2ks is just HELL BENT on replacing the stock header, even after multiple members have told them to leave it alone?

Don't touch the header. Get a test pipe and maybe an intake. Then get it tuned, that's the best bang for the buck. You will see minimal top end gains, but mid range gains by lowering vtec will be substantial.

 

Read, test pipe AND tune

 

I have an 05 with the invidia test pipe and K&N intake. What do I need to get so I can tune it to get more out of it?

 

Why is it that every person who comes in here with little to no experience in tuning S2ks is just HELL BENT on replacing the stock header, even after multiple members have told them to leave it alone?

Don't touch the header. Get a test pipe and maybe an intake. Then get it tuned, that's the best bang for the buck. You will see minimal top end gains, but mid range gains by lowering vtec will be substantial.
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B/c Gran Turismo taught us that a Header with no tune is good for 30 whp