Ok, So I just put on the new headers on my car and it sounds redicously loud now. But after I drove on the highway for a bit just to "wear" them in, the chrome is kinda tinted a light yellow-ish. Maybe its a old school mechanic trick but I thought if that was the case you would be running too lean. I have a have a cold air intake custom 2.5 in. cat back and a OBX-r highflow header the only thing thats stock on this thing is the orignal cat. I got rid of the resonator so its loud and Im taking in hella air and pushing out hella air.

I heard our computers cant be tuned in the 2.0L So how do i compensate for this? Do I really have to buy a Stand alone fuel management system?

 

The chrome will yellow and blue with heat. I doubt you're running lean. You could hook up an A/F gauge to see where you are running, but you are right in that you wouldneed some kind of piggybackor standalone fuel management to tune your car. (Or any Mazda)

 

is your CEL permanently illuminated since youve installed the OBX-r highflow header?

 

No my CEL is not on. I found out that both O2 sensors are located on the header is because in btween both of thoes is a "warm up" cat and thus one before and one after. The new header eliminated that cat. However I bought an O2 simulator that plug into the rear o2 sensor which puts the sensor in a "loop" supposidly. However, occasional i will throw a a CEL and the code is a 139 (I think) but what ever the number its " 02 sensor sckt slow response Bank 1 Sensor 2" which is the rear one. I dunno if I floor it right off the line It doesn't seem too hesitant. A very very tad bit more than with the stock header. and my steering wheel viberates like hell but after it his 2100 it takes off like a rocket. However, first i thought when the VVT kicked in but i think its stock tuned at 3k