I was bored at work the other day so I started reading my owners manual. And I remembered it saying only to put premium 93 octane in the car (being that its German and such I assume) lol but yeah it got Rid of the exhaust smell when I'm idling for a long period of time. It also made the cold starts alot smoother. And it feels like it runs smoother with the higher octane. The only problem is . It's 50 cents more where I live. Would it be cheaper to buy regular 87 then put octane booster in or just do it the right way and put 93 in. I'm looking for 94 aswell I've see it around here before. But anyway, what do you guys run? Ill be slipping in a few gallons of race gas from my uncles race shop everytime i fill up (114 octane) the only problem is its 14$ but i will. once I get an exhaust.