I've read it's a 50hp increase with a good custom tune in a 5.7. It sounds like HotRodDave has some first hand experience with 392 came in 5.7's so I was just wondering what his experience is and whether he got a tune

Which 6.4 did you get? An SRT or Big Gas Truck?

Last edited by WO23Coronet; 05/11/17 03:08 PM.