Few questions

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What is the stock fuel pressure on an sr20 redtop?

Also which wires do you connect to each other to install a q45 maf? I got the maf and pigtail but i can't find a write up on it anywhere.

Also does anyone have a faq or write up on how to weld a diff?

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Also something I noticed yesterday was that the throttle posistion sensor plus on the harness has 6 wires on it and 6 plugs. Isn't the sr20 one supposed to have 3?