Exhaust

Minimum order quantity: 4

Used to fasten exhaust manifold/headers TO the engine. High-heat, premium copper clad, exhaust manifold/header to engine block lock nut. These are the same nuts found in the Himni Racing V2 turbos kits. Top lock design holds strong under the most demanding rotary engine conditions but is not prone to seizing like standard stock steel nuts. They hold strong & remove smoothly. They will keep your housing studs in tack for years to come. Busted, removed, stripped or seized studs & housing threads are no longer an issue. Price is per nut. Minimum order quantity is 4.

Below is a quick, off hand fitment for your application.

79-85 FB Mazda RX-7 (Fits both 12A & 13B)
Manifold/Header to Engine: 4 needed

86-92 FC3S Mazda RX-7 (13B 6 port Non-turbo)
Manifold/Header to Engine: 4 needed

87-92 FC3S Mazda RX-7 (13BT 4 port Turbo II)
Turbo Manifold to Engine: 4 needed
Turbocharger to Manifold: 4 needed
Downpipe to Turbocharger: 3 needed

93-99 FD3S Mazda RX-7 (13B-REW Twin Turbo)
Turbo Manifold to Engine: 4 needed
Twin Turbochargers to Manifold: 6 needed
Downpipe to Twin Turbochargers: 4 needed

13B-RE Cosmo Engine (2 rotor, twin turbo)
Turbo Manifold to Engine: 4 needed

20B Cosmo Engine (3 rotor, twin turbo)
Turbo Manifold to Engine: 6 needed
Twin Turbochargers to Manifold: 6 needed

04-09 Mazda RX-8 (2 rotor Renesis)
Manifold/Header to Engine: 6 needed

Minimum order quantity: 4 Used to faste...

Minimum order quantity: 4 Used to faste...

Minimum order quantity: 4 Used to faste...

This item is OUT OF STOCK & ON BACKORDER with no ETA available. A Wide Open exhaust that's boost activated!! Great for stock or performance exhaust systems.

Pick the pipe diameter form above, that best suits your exhaust. Can be clamped or welded into place.

This boost activated exhaust cut-out completely bypasses, on demand, the restrictive exhaust system only when boost is present. As soon as a turbocharger or supercharger spools, the cut-out valve automatically begins to open. By the time the turbo or supercharger makes full boost, the valve is fully open. The exhaust flow dumps out the side of the cut-out valve, relieving all the unwanted exhaust system restriction & back pressure to allow the engine to make it's maximum horse power. As soon as you lift off the gas or drop the boost pressure, the cut-out valve closes again & the pressure flows through the exhaust system as usual.

Totally quiet and stock-like sounding during startup, idle, cruising, stopping, etc.
No delay in valve response, yet very smooth transition into boost/open mode.
Automatic opening & closing, using existing boost source on a turbo engine and does not rely on nuts or electrical motors.
You can integrate a boost controller to control when the valve opens or completely turn it off.
Takes care of virtually all complaints associated with large 3” cat-back exhaust systems.

Note: Very EZ installation... Mounts inline of the exhaust system & can be clamped or welded into place. A vacuum hose runs from a boost reference source (i.e. the turbo or supercharger it's self, a intake manifold nipple, intercooler tubing, etc.) directly to the cut-out valve.

This item is OUT OF STOCK & ON BACKORDE...

This item is OUT OF STOCK & ON BACKORDE...

This item is OUT OF STOCK & ON BACKORDE...