yea thats whats wierd...it didnt happen right after i got it installed, i started guzzlin gas like 2 weeks later. I think me hittin the gas harder had something to do with it cause it did slightly increase take-off + the sound of it lol. But im really not floorin it or anything, and went through and cleaned the throttle body, and MAF, and got my fuel system professionally cleaned. Its only picked up maybe 1mpg from that. I dont know what else to think of, to check/change. I had autozone test it, no codes came up. I was possibly wondering if my Oxygen Sensors were bad, but it didnt throw a code.
HELP!!! lol