Throwing you back to gadget's site, on his truck, the K&N LOST 10 hp over the stock airbox with deckplate mod.. figure that one out...
http://www.gadgetonline.com/AirInduction.htm
Also this is what i would go with if i put an intake on my 4runner
http://www.airaid.com/510-734_Toyota.asp
it replaces teh tube and the air filter... i would then do the elbow mod and the deckplate mod to get the most power. This set up is proven to give the most power.

Oh, and any aftermarket intake (including just doing the deckplate mod) will lean out your supercharged motor unless you are running fuel management.

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim