Hey everyone

Still a newbie to the Subaru community. My engine light came on whilst doing around 80 ish on motorway, heard a slight judder so i de-accelerated, this is when the ECL came on. I tried to accelerate but wouldn't pick up. After i stopped i switched car on and off but the ECL was still on. Didn't want to risk putting my foot down but seems kinda fine when cruising. It was the first time i drove hard since putting the header manifold an up pipe back to standard. Any help would be appreciated