Guys I am running a GT 3071 and have a custom made Turbo Inlet of 100mm (3.94 inches) running to a SRI which is 71mm (3 inches). My question is, I want to change the the SRI to same size as my Turbo Inlet, has anyone else done this and have you had any MAF sensor issues i.e. over fueling problems?
your way better off making your custom inlet pipe the same diameter as your intake. mainly because your loosing air velocity going from 3'' to 4'' and plus if you make the diameter of your mafs larger it will distort the signal. you will need to custom tune and an aftermarket larger mafs which is expensive and totally unnecessary, unless your building a drag car or something.