Even with the flat panel style,running boost up to 12#. With this filter I don't see where the truck is starving for air.The turbo really spools up and I can hear it very will inside the cab. Normal boost runs around 10# and this is where you can really hear it. Above 10# it starts going away,at least I don't notice it as much. So it seems like 10# is tops or better any way. No intercooler. At 12# I use the water any way.Now it's a heavy drag truck