alky vs propaine

[GrandNational87]

i know how the alky works for the egine and what the results are but im wondering how is it compared to the propaine kits out there. and does propaine affect your engine in anyway. and how if there is any thanks

 

[zam70]

They work in very similar ways.
their biggest value is the additional cooling of the intake charge with some actane boost as a bonus