I'm not sure about HP gains on a S/C, but Greddy rates their increase from an intercooler (one that doesn't cause much lag or heat soaking) to increase from 20-30HP at the same boost level. I would assume this is run at a maximum of 9psi on a Civic. I would never run more than that without an intercooler. Too damn hot baby!
http://home.satx.rr.com/importvelocity/
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'04 SRT4 [Black] - 13.46 @ 102.9 (2.09 60') - R.I.P.
1999 Civic EX Turbo
.:ATP Up Pipe .:HKS SSQ w/Purple Insert .:K&N Typhoon CAI
.:Greddy Full Auto TT .:Greddy Profec B Spec II EBC .:Greddy Catch Can
.:AGP Billet Wastegate
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.:Stock Ass-whoopin Installed
Dyno Proven - 234.6whp / 250.9tq
13.66 Video