I surely think it won't be a problem. lil aged engines have better sound.(just my opinion.)inside of the cab side and rear window were opened. hope could be helped
what model Flow's are you using?
I'm gonna get something for mine soon and its hard to hear what the different models sound like
The down side is that I'm sure mine will sound nice buts it aint a hemi just standard 5.9 Magnum. Just gonna make me wanna do more