Hard to say mate, i asked the same about a brand new bottom end i want to sell.

Things like the cross over pipe, inlet manifold etc wont fetch a lot, and postage usually lowers the price u actually get further.

Sell the ECU seperately, i sold mine on eBay for £90 and that was my buy it now price, good £100 easy i reckon

Metering unit £30-40ish.

Intercooler should fetch what its worth they usually do.