good or bad
 

so in my car when i open my windows or doors it sounds like it gets twice as loud ( have a 98eagle talon) this a good thing for spl or bad have not been tested yet

its common to gain SPL with windows open, can't useally hear much if a differance at times..

juring SPL comp's your not aloud to have your window open, so if you do any testing, make sure to have your car sealed up.

With stuff in the mid 50's, I push 146.1 with any amount of windows open.

My highest SPL is 146.3 at ~43hz with the windows closed. Gotta love reflections.