Originally Posted by vil9j

This may of have been brought up before but i have not found anything on it. I am thinking about ordering the mid-pipe from AAM because of the dyno gains they show on their charts. I already have the short tails. However, I was wondering if I Install the mid-pipe would I need a tune right after? Will it make my 370 run too lean or rich etc? Thank you guys for your help. I really appreciate it.