Gas Mileage Options

[o0black0o]

I put some 3-2-1 headers on bout 2 weeks ago. We also removed cat and placed a gutted one. I would of assumed i would be getting better gas mileage. but Im accually down 100 miles per tank. We did reset the ECU, via pulling the battery cable for 10 minutes. Shouldn't I get better mileage by at least like 1mpg or something or is this common? I have the 7afe so It might differ from the 5s.

Also I dono if this might be a cause but, I installed an auto meter A/F raito gauge its not reading. I currently have no Check Engine Light. But Since my light isn't on my O2 Sesor should be fine. Its only abour 3 months old. Am i right?

[Bitter]

removing the battery cable is just fine, all you need to do is interrupt power to the PCM for a period of time. pulling the fuse achieves the same result, just wont have to reprogram the radio afterwards.