You're definately going to need a re tune to make up for the extra air flow (it will give you even more power).
Gadget's tests were in his early days prior to the MAF calibrator... when you can tune for more flow... you usually get more power...

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