i have heard stories that having an MBC needs tunning because the car would run lean..other stories would say that the car runs "so" rich and you could have an MBC without tunning..i am still confused...my mind is set on MBC, walbro 255lph, and Re-flash.

 

if you push the psi yes

 

not enough to worry about and yes the car is pig rich from factory, to test this theory just inhale the exhaust fumes for a good 5 mins (it smells bad at first but after the first minute it's the shiite, just like gasoline .