Richard from RCC Turbos has just finished a run of billet stage 1 plenums, we are now offering these as an upgrade to the stage 1 kits, typical cost for the upgrade will be an additional $400. But for a limited time POWERHOUSE will be offering them as a $200 upgrade, we have 3 for the gen 1 busa and 3 for the gen 2 busa, so the first 3 individuals to purchase kits for the gen 1 and the first 3 to purchase kits for the gen 2 can have the billet plenum included in their stage 1 kits for the special price of $200. This is on a first come first serve basis, once these 6 are gone the billet plenum will be a $400 option . . .