The Wagner worked great for me. It is huge and probably one of the largest. The pressure drop is low as well, which in theory should = more power... MPT recommended the Wagner Competition Intercooler. It appears there are other good choices as well.
I installed the Wagner my self in my garage. It would be nice to have a helper just to guide the fan and intercooler assembly into place. No need to lift the truck though.
I will say as others have stated the instructions are pretty bad. You have to really look at the photos. The install was not bad and it still retains the louvers and the intercooler fans.
I took some photos of the install which may answer some questions. It took me a few hours... I took my time.
mehttp://www.morepowertuning.com/wagnerevo-200001119
People seem like the Whipple intercooler too. The ADD and Full Race are probably the coolest looking....