I'm offering a bespoke custom made plenum for a turbocharged ls7 engine.  I've been selling these for at least 10 years but in very limited numbers.  The base holds a water tank sitting under two charge cooler cores with a large fin per inch ratio.  All of this is hand fabricated in brass and soldered together by 'old school' british craftsmen.  It's then pressure tested and there are no internal connections that may risk a leakage. The flanges are sealed to the heads with rubber 'O' rings in cnc'd grooves.   I can incorporate quad fuel rails nitrous ports or water injection at an additional cost.  Contact me for costs. The auction is for a plenum with the water tank, heat exchangers, lid and flanges only.    It takes time to manufacture this, estimate at 8-12 weeks from payment.