I replaced an '04 L with my '05 SSr LS2 - 6 Speed and while I love my SSr the L with its 10 lbs of boost from the factory will run rings around the SSr. I don't believe that adding a S/C (Magnuson) would get the job done. The Mag with the provide stock pullies only put out about 5-5.5 Lbs of boost that should get you max 80-100 HP. Granted the L is only 380 HP but it's torque on low end is fantastic while the SSr's power band is 4000+ rpm. Once you get in that range and can shift without dropping to many RPM you can do OK but the L is long gone by then.
I have the Mag S/C on my LS1 6-speed Vette with Cam/header and differnt pully (7-7.2 lbs) and I know it will beat a factory L

I can't speak for a ProCharger on the 5.3 SSr's but I think L would still be hard to beat.
If you want to have a FUN FUN ride the add the Mag S/C but don't expect it to be a top notch DRAG RACER.
Just my $.02
George
I have the Mag S/C on my LS1 6-speed Vette with Cam/header and differnt pully (7-7.2 lbs) and I know it will beat a factory L
I can't speak for a ProCharger on the 5.3 SSr's but I think L would still be hard to beat.
If you want to have a FUN FUN ride the add the Mag S/C but don't expect it to be a top notch DRAG RACER.
Just my $.02
George
