
A big difference if you have an ultimate most of wiring is already there the harness for rear speakers is plug and play unbolt Dr seat to install woofer that most difficult with trimming the rear panel can easily be done in a couple hrs. 4hrs if your super picky and double check 3 times before cutting. I've add every accessory to mine other than a couple love the ride a cabin comfort I even add Elka suspension I would say that was best upgrade completely changed handling on rough trailsJBL 4200 I cannot find any info on the realistic time frame fir the do it yourself install Thanks in advance - Mike