there are a couple places around that love to turbo the 2jz-ge powerplant, but be prepared to spend 5-10k.
www.powerhouseracing.com www.titanmotorsports.com vinnyten.com just to name a few.
for cheap mods, you will get cheap horswepower.
change to a better air filter. open up the exhaust, add a downpipe. oh, wait, those are turbo engine mods. na's suck for powering up. thats whay everyone gets turbos or nos. sorry.
maybe your new baby needs a tuneup to make the HP it should.
check out
www.mkiv.com and see what they list for n'a power mods. most likely they will just talk about big single turbos as well.