it must not be every state (im in Arizona) but i have traded in a car and a truck in the past 8 months for new. Also know 2 others who have traded in trucks as well and same. They did NOT check out anything like that. My last truck before trade in was modified. Has all the wires running for two 12 inch subs, they didnt care or check, i had a exhaust and resonator delete they didnt even turn on the truck or care, had muti color LED footwell lights and nothing, windsheild and windows were limo all around and nothing.
what im getting at is i believe
@theblet is right, i dont think they are going to care at all nor will it change the value on the trade in for long tube headers of all things. Shoot if anything another buyer will think OH COOL NO BROKEN EXHAUST MANIFOLD OR BOLTS! i know i would