thanks everybody for the info... im not a serious competitor yet i have a lot to learn i have done some small local competions but never considered myself a real competitor yet but hope to get their one day but hoping this new setup will bring some good spl numbers my main goal is to hit 150 or above i havent succeeded but i hope the setup will do the trick? i know there are some many factor with setups, cars , dynamat, box size etc but any ideas what number to expect? and thankyou everybody for the comments i greatly appreciate it.