Despite what some fuel additive manufacturers would have you believe, PEAs are not the only chemistry capable of cleaning carbon from combustion chambers. As such, Berryman B-12 Chemtool Total Fuel System Clean-Up (part #2616) contains a proprietary PEA alternative. However, you could instead use B-12 Chemtool Total Combustion Cleaning Kit (part #2610), which does contain PEAs chemistry. Both products are very effective at cleaning intake ports, intake valves, and combustion chambers in a single application. 2616 also cleans fuel injectors and carburetors.