I am under the assumption the can tunes are only good for stock cars. I saw horsepower gains using the tuner wen my car was stock , but running cat less mids and a cai nothing happens wen I run the modified stock or the 91 I get the same horse power and tq. actually I loose power wen running the can ...

I have a 2014 charger rt with mopar cai and cat less mids. I put the 91 tune on and tweak the wot fuel and wot spark both ways but no matter what I do to the car the computer always pulls timing and makes the same afr. ive had it on the dyno multiple runs tune or no tune and actually saw same hp and ...