I thikn because its so free flowing is the issue you get from the headers...

 

So what's going on now?

 

at this point I found out that the cats were okay...it through some codes when my SES light came on....2 of the codes that I could get were thermostat, A/F and cylinder misfire...other than that I have a Scanner that I scanned the car and cleared them and everything is running normal again..i still may go back to stock manifolds

 

Hrmm thats weird, my SES light came on and Im throwing throttle body codes Let me know what you do to fix your issues, gl buddy

 

I couldnt pull the others one that came up...so far no issues after the clear.