Yeah I did an E30 mix with Torco booster when I was stock turbos and before my lpfp upgrade. Car ran fine so no cons. As far as pros, yeah it had less avg ign pulls over just E30 so that allowed a tad more boost. Dont know if it was worth it tho. It was 2 years ago and I only did it a handful of times so to me it probably wasnt but I honestly dont remember.
Also there are only a couple true octane boosters. The rest are garbage.
Any idea how far it can raise octane ? Ive heard of crappy ones going from say 91 to 91.1 octane. Im looking for something to raise it minimum 3 octane safely.