Car is 2014 st1 tuned with Cobb AP3/Stratified. I have drop in K&N filter ( same as green filter), CP-e Delta FMIC, CP-e Exhale kit w/ tial bov, vacuum is being pulled from symposer delete.

I've only had a couple minor issues since I started modding, blew off the hotside charge pipe once (hairspray and cranking down the shitty worm-drive fixed that). I get up in the rpms (around 4500-5000) and it feels like the ecu is cutting power but only momentarily. I haven't actually set aside time to pull some logs so I honestly don't know what exactly is happening but it will hit the rpm range in 4th on the freeway and "sputter" for fractions of a second each drop in power (this is with stock traction control on, and Cobb/stratified TC off) and the AP didn't show any kind of timing correction besides 0/ 3 on the min/max. I've been reading a lot and I'm going to do 1-step colder plugs just to be on the safe side and I'm dropping back to Cobb stage 2 91 octane tune (I was on stratified "stage 2" 93 octane) because it could possibly be the fuel. I am running 76 fuel, pump said 93oct but I dumped a bottle of 104 octane boost just to be sure since 93 octane from the pump is a pain to find in this area.