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f it is a tpc supercharger then only one seller - tpc (ignore those that have no idea what they are talking about and feel the need to let the world know it).
boost is controlled by pulley size so no variables there unless you modify the kit.
these kits are no longer around for several reasons:
tpc went to turbo kits instead.
the kit located the s/c right by the exhaust and there was a lot of heat soak. this, coupled with no intercooler, resulted in very high IAT and not a lot of power made.
only worked for the 2.5 which had different headers than the 2.7. 3.2, etc.. if you wanted to put the kit on a larger engine you (a) would have to downgrade the exhaust (which robbed power) and (b) the s/c didn't have enough flow to feed the larger engines and in some cases made less power than stock.
fuelling was achieved by adding a 7th injector on the intake manifold driven by a piggyback controller. the 7.2 dme hadn't been broken yet so they took a hack approach to getting it done.
this was one of the first forced induction kits on the market for the 986 and killed quite a few engines due to poor implementation (IAT, fuelling) and didn't give enough power to make the risk worth it. unfortunately, once the internet got ahold of it the mantra became "you can't boost these engines" when the failure was the implementation and not the concept.
in your case (a) make sure you have all the parts. there are a bunch of bespoke bits of ductwork and brackets that are often missing from the kits. and (b) consider going with a custom tune instead of the generic 7th injector and piggyback controller used by tpc. also perhaps a wrap or ceramic coating on the exhaust to limit heat transfer and, if you are handy, an intercooler (but packaging becomes an issue; you'll have to decide air/air or air/water, where to put it, etc.).
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