Im wondering what size i need. i was thinking 70mm, wouldnt u have to get both the same size. Are these just boltons or will i need further modification

 

the mass air has to be bigger than the throttle body size and if you dont have any serious mods i would just stick with the stock throttle body

 

yes the 70mm is a good size tb and id go at least 73mm for the maf but like mustang30240 said, if you dont have a lot of mods, the tb and maf wont help much if any

 

I would get the 85mm MAM and a 70mm TB. Thats the best setup.

 

anything over 70mm for the tbody and youll lose low end torque if not blown. and the maf will take calibration or your car will run like dog meat. bullitt intake with a twin 65 is way better though :-P 85mm maf would be great.

 

yea 70mm owns you, 75 won't make as much average power as a 70 on 99% of NA cars