|Genie used the be sold by JWT but is not available anymore.
Stillen no longer sells or makes exhausts for Z32. I do have a <5K mile Stillen system which is considered to have bee among the least loud. It's all stainless w. X pipe and quad tip.
B&B is still available new.
Borla is no longer available I believe
HKS still makes the HiPower (aka Hyper) but it's for 20 year olds and is not stainless.
Greddy - dunno, it's been years since the SP2 system came out and the original SP and PE exhaust systems they sold had mild steel pipes which have rusted out by now in most cases.
I also have a brand new old stock Thermal Research cat back w. resonators which was US made. Quad tip all stainless.
President of Z-Car Club of Northern Virginia
1995 Nissan 300ZX TwinTurbo in Cobalt Green
1997 Nissan 240SX SE in Ultra Red
2006 Nissan Frontier SE in Ultra Black