104 Plus Ultra Concentrated Octane Boost

from Fearless old monicker

With fuel being what it is these days I never fuel the Harley with out the boost from 104+. Motor runs smoother revs quicker more power. I will be having a long relationship with 104+ as well as th...

from abakar944

I had my Porsche 944 Turbo using the 104 for years. I decide to modify the cylinder head for better performance. Once I took it apart I was extremely amaze how clean were the pistons, valve steam...

from Bob C

Add 4oz to every tankful for the Mere 225x Pro Max, 750 hours without a fouling problem, spark plugs clean as a whistle.....well worth the piece-of-mind. [This review was collected as part of a pro...

from jaydee

Reduces knock as evidenced by reduced timing pull on a cylinder basis. Not as much as 100 octane does, but tiny improvement over pump gas. Does turn the plug porcelain reddish, so be prepared for t...

from GiGi

I used this in my 1969 Camaro SS/RS. It has a 396 big block motor so doesn't like regular pump gas so much and only some stations have 93 octane. When I used the 104, the engine ran smooth and no...