hey right now i have stock 240's and wrx turbo setup with safc2, i have no oxygen sensor put in yet. im getting about 16mpg even if im driving good, im afraid when i put my 450's in it will go down even more.....

my question is if i put 450's in and adjust safc2 correctly and weld in a oxygen sensor will that get me better mpg?? also this is a 92 civic hb, should the bung be welded on the DP??

 

anyone please??

 

no o2 sensor means that your car has no reading when it goes into closed loop mode. get an o2 sensor.

 

weld the bung on the DP? that help my mpg?