hello all i am new here and have been searching for power adders as i have an 08 chev 1/2ton extended cab 2wd 5.3 with 3.73 gears. i have firestone airbags in the rear 2 1/2" cat back with flowmaster super 44 muffler. towing a 27' bumper pull travel trailer first trip to the lake then another trip pulling 20' mariah boat. i know this horse has been beat down but i need some help, wife says no to a new duramax. diablo and airraid tube? is there enough difference to make the purchase or just live with it?