Okay, so I basically called a friend the other day after I received all the exhaust parts for my 2013 wrx to come over and help me install them. After we installed the 3 inch turbo back straight pipe with the nameless muffler delete we ran into some issues with the check engine. I ran the cobb accessport before I started the car for the first time for a stage 2 map on 93 octane. We installed a DNA catless downpipe, with the midpipes from them and it bolted up to the axleback nameless muffler delete, not only is it unbearably loud, I'm getting a check engine light. After I ran the stage 2 tune it was fine, even the next morning for the first start up no check engine. Now I'm getting it, as well as a boost surge every once and a while.
1. If I install a resonator will it cut down the noise inside the car as well as cut it down just by cruising around?
2. Should I invest in a pro tune to set the car on the right path of stage 2?
Any information would be great, thank you