I've got a hx35W gated housing, 12cm with a welded flapper and an outlet flange I'm looking to possibly trade for a 16cm with an outlet flange or at least enough cash to cover a new one.

Yes but that's a Big H1C. The smaller ones have more different bearing housings.

H1C - 3531667: Compressor wheel: 56mm inducer, 83mm exducer Turbine Wheel: 70mm inducer, 60mm exducer

I have a H1C that I can't identify. Assy # 3531667High Tech Turbo said its a 56mm compressor wheel but I thought H1c's had at largest a 54mm?

MHI 20g goes for 600$ on forceperformance. If you really want the Cylcone version go on car-part.com and look it up. They're around for decent prices. Might need a rebuild but it'd still be cheaper and you'd have a like new turbo.

Any thought go into tube length or diameter? Tubular > cast any day but there are principles to maxxing your gains. I figure if you're customing you might as well make the most of it.

You adjusted the clutch pedal right? If it isn't adjusted it can keep the plates from fully engaging thus making it slip and wear out.It also depends on the disc. The organic discs go fast...

The trick is finding something that looks good AND is lightweight. Then you get performance and looks.

Old engines have gunk, just kind of how it goes. Valve cover gasket could be bad. When you blew the oil seal on the turbo did it spray the engine? A little oil attracts a huge amount of dirt, my guess it that's what you're looking at.

Any mathematics behind that thing?

Vac readings are good. Should always drop just a tidbit from park to drive.That's a solid list. I'd get the tb ported to 63mm to match the intercooler piping and have the UM matched to the tb. Then maybe a longblock...

I'm a Motegi fan, all the way. Very nice wheels.

Rear gauges are cheap and easy to put in.Old gauge can be off for any reasons ranging from cracked wiring to a kinked hose.

Have you tried a new CAS? If the wheel itself is dirty or bent or even just a little bit loose (and subject to vibration) you may still get good readings when you test it but upon real use it'll malfunction.

Mothers clay bar = best car cleaning product on the market. The only thing it won't get rid of is that can. ;)