I think that you have to tune, I did the MMR CAI and the SCT 2, and the difference is HUGE!!!!!!!! So worth the extra 400 bucks, tune for 91 octane. It made up for the bit of sluggishness I got after putting on 20" wheels.mustangbaxter said:
I think that you have to tune, I did the MMR CAI and the SCT 2, and the difference is HUGE!!!!!!!! So worth the extra 400 bucks, tune for 91 octane. It made up for the bit of sluggishness I got after putting on 20" wheels.mustangbaxter said:OK well I have a MMR CAI followed all instrutions, I did not tune, and I dont have the H/C, none from factory. This AM I got a CEL, any one know if I can still run with this MMR CAI, and not get a tune, and keep the CEL light off? Thanks Tim