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not sure if you're aware, swapping the throttle body PLATE from a Volvo 960 into your 850 will give you noticeably more off-the-line pickup. Easy fix for more power.
"wires, plugs, filter, coil etc..."
to add to that list: distributor rotor & cap, silicone hoses, vacuum lines, and switch to synthetic oil (if you have no leaks). A K&N air filter gave mine a bit more pickup, in combination with all these; you could look into a cone conversion kit as well...might give you a bit nicer noise. The N/A engines have a really nice sound to them already.
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