i may be intrested if you can explain the core charge. Is it like I put the new ones on and send you my old ones back, then i get my refund?

'99 SilFro SE V6 MTX Alpine CDA-9833, 12" L7, Pioneer 6x8's, Fidanza Short Throw, K&N Drop-In, Spec1 Clutch/Flywheel, WR Headers / Y-Pipe, TBz Cat, PRT Roll Resistors Mods in queue: Trubendz Res. Magnaflow Ex. SVT UIM/LIM/Opt.TB