90 DB.... That's way way WAY too high. 90DB is VERY loud. 90 DB is louder than a Freight Train rushing by at 70mph.

 

90 db is loud, actually its the point where OSHA says you ned to implement a hearing protecton program, but it also depends on the frequency of the sound. if the sound is of low frequency (as your magnum would be) it can still be high in decibles but not percieved to be as high as a high frequency at the same decibles because our ears arer more sensitive to higher pitches. lol not like i really care because i like my truck loud as well. just somthing to think about...

 

just remember it was measured with an iphone. and it measure noise not different freq or pitches.