l bought a 1990 300zx Na model and l wanna do a twin turbo swap, how much on would it cost me to do it?

idk
i dont know that much
but im guessing around $7000
but that would be sick dude

Around 3500-4000.

I've done a few of them.

Look into getting a JDM clip, it will save you tons of time, money, and effort.

But by the time you're done with it, add the cost of your car, to the cost of the parts.

Is it less than buying a TT model?

If not, scrap the idea, and buy a TT.

If it is, then go for it.

That depends on if ur doing the work, or having a shop do it. l got mine done for 4200. l got an engine & tranny combo off ebay for 1500 (with both ecu's). also front mount intercooler (ebay also) with piping for 300.00. A gt600r turbo kit from z1 motor sports for 1800 (on sale) . l did the swap myself (with help from a few friends) & tips from twinturbo.net. The rest was various hoses & seals. l basically did the 60k maint package while the swap was on the hoist. It took about a week to complete & really was not that complicated. To be on the safe side look to drop atleast 5k if u do it correctly buy replaces all the hoses & gaskets. l figure if u go through all that trouble, while the engine is out, make it close to brand new as possible. Good Luck