I've had both PSi and Speartech...the Speartech is the nicer looking of the 2 and seems to be better built. I could be wrong, though. It's cost is much higher. The braiding they use is the softer material making to easier to tuck in and around things compared to the corrugated stuff. There wires seem to be more pliable. Also, Speartech provides provisions for AC and cruise control. Their fuse panel is less bulky and no need to run wires down to the starter like with PSi.
Both companies are always quick to provide tech support.
I have no experience with a GM harness, but if I already had one....I'd definitely use it and spend money somewhere else. Something always comes up that you didn't expect.
BTW Vegas...that engine bay looks great!
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1971 Firebird
2017 SS
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