What mods should I do to my 240sx?

Ok, so I have a 1991 240sx that ive had for about a year now.
The car is CLEAN, no known problems or anything like that. Im pretty good with cars and my dad is very good with mechanic work. So it boils down to, what should I do first(Turbo, Exhaust, Suspension, Enigine, Intake, etc) and be specific please. And dont say get an sr20det or to sell it because I love 240's. Thanks for the help!

The first thing I would do is Exhaust, and then Intake, and then Chip.
I read a book about modyfing cars and they said you should start off with those three mods.

If you get a Turbo Kit, it should come with the Intake, Intercooler, Chip, and everything else needed to run a Turbo. Max Speeding Turbo is ok.

Stock suspension is already good, but for a stiffer ride, get lowering springs. Coilovers are height adjustable springs, but cost more.

turbo charger——energy saving and environmental protection products.
coilovers—— prevent bumps

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