hello guys ive had my 04 evo since january but the last couple weeks have been weird i installed a hallmen mbc ,tbe, upper piping and lower piping and inatke all ingen and welded in my uego wideband sensor but the other day i started sputtering at 15psi like wtf so i changed the plugs with some ngk extreme ones no such change anyone wanna help?

maybe fuel?? injectors??

Maybe fuel cuts? check your AFR when it sputters. Or what are your plugs gapped to? try .022

i have them gapped to .0024ish i did a boost leak test found nothing i changed the plugs to night but havnt took it for a burn yet. but the weird thing is it didnt started doing it tell i installed the down pipe with the sensor like wtf

It wouldnt hurt to remove the uego wideband sensor and put back to stock just to cover your tracks to find the problem.

it wasnt a stock pipe

then the pipe that was on the car before the problem started just simply back track using the process of elimination its not that difficult.

also where to i wire the wire up to with the uego gauge

Yes I myself remember reading about someone had problems like yours after taping into the
O2 sensor and by doing that caused the sensor to give mixed readings this is very critical to the engines health and a hope you can solve this issue.I know it might be a pain to remove it but atleast you are one step closer to solving the problem.