<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/mad.gif" border="0" valign="absmiddle" alt=':angry:'> <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/mad.gif" border="0" valign="absmiddle" alt=':angry:'>
let me clear up any disputes( i didnt read all the post so...)
ok, u can get 350whp at 18psi. as long as u get the right AIRFLOW through the engine, meaning that the back pressure on the turbine is at the right pressure to spin the compressor will increasing intake manifold pressure, if u dont have the right pressure ratios, hp ratings for each pound of boost is not consistent. its pretty hard to explain, also,-someone stated that a t25 cant boost up to 25psi-wrong, hate to tell u but any turbo can boost at any level of pressure. it has to do with your exhaust flow and the ability to spin the turbine faste enough to spin the compressor.
in other words, u can take a t25 and boost 100psi, but u will not be able to reach that only if your engine can flow enough exhaust gas to spin the turbine. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt='
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so to conclude, the bigger turbo thing has to do with the amount of air it can suck in the compressor and spit out while having exhaust gases back pressure good enough to spin the turbo with out having too much pressure because u will not be getting too much HP that way