My compressor housing currently says .42 and is rather small (I'm at full 5.5psi boost @ 2700rpms). Is it possible for me to upgrade the housing to a larger size for a boost in upper end hp or does the wheel have to be changed also?

Where would I get a new compressor housing?

 

as long as you get another housing that uses the same wheel specs youll be fine , i upgraded mine.
check out Cheapturbo.com

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jz &raquo;</TD></TR><TR><TD CLASS="quote">i went down to a smaller housing on my t3. it was an old tbird garrett. with the flange type inlet outlet on the housing. i switched to a old nissan 300 z housing just so i could run a filter because of the shitty design of my drop shop mani. but all i did was change the housing and nothing else. it spools soooooo much quicker now too, but not as much high end but i might plan on redoing evrything. anyways i still have my old t bird housing with the flanges on it so you can use couplings. i dunno if its the same as what you got now or if it will even fit with your wheel. </TD></TR></TABLE>

did you get the 84-89 300zx t3 .63A/R housing? if so, the 5bolt pattern is not a standard T3 pattern. i need to find another housing but its turning out to be more difficult and costly than i thought.