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I put a Magnuson blower on my 2004 LS6 Z06 and now have the replaced original components for sale so ask your input on general pricing value. My manifold will be sold with fuel rails and all eight LS6 injectors. Air intake duct with hose and clamp. Also included are left and right side original red fuel rain covers. All in very good undamaged original condition.
I would check eBay and LS1Tech for recent sales to get a good idea of current market value. I would also sell everything separately, i.e. manifold as one item, injectors as one item, fuel rails as one item, air intake as one item, and fuel rail covers as one item. You can always offer a discount for a package deal, if you want.
As previous posted suggested, you can find out a good bit by checking the For Sale sections of this Forum and others as well as eBay.
The intake manifold alone, in good condition, rarely sells for less than $375 and is typically quite a bit more. You'll want to be sure to include the mileage on the items since folks, like me, will always ask. It's pretty important to know the mileage on the injectors especially.
Post good pics as that always keeps the interest, and the price, up!!
Good luck and welcome to the Forum!!!