Dbl_D718

I'm looking at a C4 Vette with a few aftermarket parts installed. The Lingenfelter pieces look to be discontinued and I'm having a hard time finding what they're worth (if anything). I'm curious because I'd likely pull them off to replace with something different.

Can you guys give me an idea of what the Lingenfelter forced air intake and Lingenfelter cat-back would bring in the FS section? Would the cat-back be worth a straight up trade for a Magnaflow system?

Same goes for the chrome ZR1 sawblades on it; what would those be worth without tires?

Thanks for helping a Corvette newbie