hey everyone first let me say im new to this forum and am looking forward to all the help and modding im gonna do to my 03 evo. Right now my evo is stock and i was considering getting a boost controller and wondering how much boost is safe for a stock evo. Or should i do other mods first and wait on the boost? thanks for all the help

 

do some searching. its not hard to find. you will find most daily driver tunes are running 21-23 psi to be safe and conservative.