The hemi twin-cam head has one high-level air bleed per cylinder for the water jacket which feeds into this large high mounted swirl pot for deaeration. This greatly improves cooling.
Hytech exhaust made this cool header out of 304 stainless tubing. Those bulges in the primary tubes near the head flange are reversion traps. These give more power and a wider powerband especially on engines with a lot of camshaft overlap like this one.
The header primary tubes feed into this 4-1 Burns merged collector with a 2.25″ venturi. The Burns collector gives more peak power and a wider powerband to boot. It’s hard to see, but lurking under the header collector is a really trick transmission. A stock Alfa transmission case has been modified to use Hewland internals with 5 dog shifted forward gears! An AP 5.25″ low inertia clutch on a lightweight aluminum flywheel transfers the power to the transmission.
The collector flairs to a 3″ 304 stainless exhaust connected with a V band clamp.
The exhaust is hung on beehive springs for durability and give, allowing the exhaust to expand and move freely. The exhaust transitions to oval tubing with a center rib to prevent it from cracking, a problem with oval tubing.
A lightweight Burns Stainless muffler keeps things from getting too loud. We really like this muffler because it’s light, rebuildable, and pretty quiet considering what it is.