All good input... this COULD be one of the early 9 psi fitments on a 3.2L car.
Two main areas of gain:
(1) improved airflow
(2) reduced weight
You can get (2) with most modern aftermarket gear... the C32 (97+) already has "headers" (unlike the boat-anchor exhaust manifolds on the 3.0 motor), but aftermarket (c-TECH, RM, etc) still save weight.
c-tech and some of the JDM aftermarket exhausts save weight over stock, and give it a nicer, go-fast sound (worth at least 5-10 PERCEIVED hp IMO
)
intakes -- you probably want to optimize these as well
For (1), increasing flow-through in one area shifts the bottleneck to another. IMO you need to look at all areas (intake, headers, exhaust, possibly even cats)
As far as exhaust blow-outs go, you might want to read nsxfiles.com -- the owner and website author is a noted NSX hot shoe who has been playing with this stuff since its inception, and has played with most domestically available exhausts. As far as I recall: they all work, and they ALL break. Again, what blows them out is sustained boost at WOT -- the kind you often see only on the track
HTH
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Manuel C
93 NSX S/B #394
93 300CE
93 NH750