I have the D16Z6 with CAI and Exhaust, about to throw DC 4-2-1 header on there, heard that it might make it run lean, bad for engine. SHould I wait and get a new fuel regulator brefore I put header on.
Please advise, thanks

 

NO I dont think so.. I used to have experience for AEM CAI, Greddy EVO, and DC 4-1.. It doesnt run lean.. It run rich and there is nothing wrong with it.. IF you go force induction like Turbo, Supercharger, or NOs.. Yes you do need fuel system like Fuel Rail, Injectors, Fuel Pump, Regulator, and other fuel things.. SO you will be fine... LEt me know if you need any questions..

 

Put the header on... You'll be fine.

 

Put the header on, and it will run fine. If you're really worried about it, get a regulator and bump it up a couple of PSI, you might make a little more power with it as well, best way to tune it is on the dyno.