Not so much making the wake change as the ability to match a proper RPM/Torque from the engine to the perfect speed for the wake you like. http://www.acmemarine.com/html/list.html
I just picked up a model #515 from boarditup. It is a 13x12 LH. My original was a 13x14 LH, so i should get more low end power and the top end will be a bit slower. I run about 1600 lbs of ballast and was having a porpoising problem (the perfect pass would alternately accel then decellarate) Memorial day will be the first time we take it out.
Do your homework on what your needs are for this $300+ purchase.