Exhaust

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...

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...

Brand: HIMN'I Racing
- Model: HR003 SS Down pipe
- Application: 1986-1992 FC3S Mazda RX-7 using a HKS cast/log or replica style exhaust manifold/header.
- V-Band Size: 3" inch Or BorgWarner S300, select from menu.
- O2 Bung: With or without, select from menu.
- Exhaust side flange: Your choice, select from men.
- 3.00" diameter, Smooth Mandrel Bent, Straight through race design & rainbow TIG welded.
- Made in the USA using only USA produced raw materials, superior quality.
- Lifetime warranty, guaranteed to never crack, warp or otherwise fail for as long as you own it or we will repaired to replace it for FREE.
- Lead: Built to order, this item normally ships within 1-72 hours.

The HR 003 SS turbo downpipe fits turbochargers with a 3" v-band exhaust discharge/exit/outlet & designed to be used with the 86-92 HKS Cast/log turbo exhaust manifold or HKS "Style" manifolds for the 86-92 FC RX-7. Not intended for use with any other manifold.

Himni Racing 3" stainless steel, mandrel bent, race downpipe for the 86-92 Mazda RX-7. (13B rotary engine) Designed for perfect fitment with the HKS cast/log type exhaust manifold & works with all types of external wastegates. (HKS, Tial, etc) Each one is hand crafted by HR, made of solid 304 stainless steel & features V-band mounting (turbo side) & your choice of flange on the exhaust side. Smooth mandrel bent tubing with the very minimal degree of bends for maximum flow. Very strong but lightweight with nice clean fitment.

You pick the exhaust side mounting flange that best suits your needs.
Options are:
#1 No flange left open
#2 3" V-band & your choice of OD size.
#3 3" GT 4_bolt.
#4 3" 2 Bolt (like the OEM 2 Bolt)

Note: This unit is intended for custom exhausts systems & is for off road & race use only.

Brand: HIMN'I Racing - Model: HR003 SS ...

Brand: HIMN'I Racing - Model: HR003 SS ...

Brand: HIMN'I Racing - Model: HR003 SS ...

Note: Picture shows our 3" downpipe but gives you an idea of what the 4" downpipe looks like.

Fits V-band downpipe turbos using the 86-92 HKS Cast / log turbo exhaust manifold or HKS "Style" manifolds for the 86-92 FC RX-7. Not intended for use with any other manifold.

Now you can run a 4.00" downpipe on a turbo made for a 3.00"!! This is the Himni Racing 4.00" 304 stainless steel, mandrel bent, race downpipe for the 86-92 FC3S Mazda RX-7 (13BT rotary engine) It has a 3.00" v-band turbo connection (Inlet) for use with turbos that have a 3" v-band exhaust housing. It then transations to a full 4" diameter pipe. It's designed for perfect fitment with the HKS cast/log type exhaust manifold & works with all types of external wastegates. (HKS, Tial, etc) Each one is crafted of solid of 304 stainless steel & features V-band mounting (turbo side) & your choice of flange on the exhaust side. Smooth mandrel bent tubing with the very minimal degree of bends for maximum flow. Very strong but lightweight with nice clean fitment.

Available with or without Stainless steel 18mm o2 sensor bung with that works with the stock or a wideband o2 sensors. (no extra cost)

You pick the exhaust side mounting that best suits your needs.
Options are:
#1 3" Diameter No flange left open (use with 3" exhaust)
#2 4" Diameter No flange left open (use with 4" exhaust)
#3 3" V-band (for use with 3" exhaust)
#4 4" V-band (for use with 4" exhaust)
#5 3" GT 4_bolt. (for use with 3" exhaust)
Select option from Menu

Your pick of #1 WITH or #2 WITHOUT flex bellow section.
#1: WithOut the SS flex bellow is suitable for most applications. It allows for the smoothest unrestricted flow & lightest weight. A very good choice.
#2: With the SS flex bellow option, it relieves the stress put on the turbo, exhaust manifold, exhaust system, etc. when the engine moves in the bay due to hard launching & normal driving. It "eats" the shock & reduces part stress. Also allows for easier realignment when the downpipe is removed, then reinstalled. The flex bellow option is usually not necessary when using the Himni Racing solid Aluminum or Polyurethane motor mounts, as the mounts stop the engine movement.
Select option from menu.

Features & includes:
- Works on 86-92 Mazda RX-7 with HKS cast style manifold.
- 4.00" diameter Smooth Mandrel Bent, stainless steel, Straight through race design.
- Your pick of with or without 18mm stainless steel o2 sensor bung.
- Your pick of with or without SS flex bellow
- Your pick of exhaust side mounting flange
- 3 Inch V-band mounting, turbo side (fits 3" V-band turbos)
- Made to order.

Note: This unit is intended for custom exhausts systems & is for off road & race use only

Note: Picture shows our 3" downpipe but...

Note: Picture shows our 3" downpipe but...

Note: Picture shows our 3" downpipe but...

Brand: HIMN'I Racing
- Model: HR004 SS Down pipe
- Application: 1986-1992 FC3S Mazda RX-7 using a HKS cast/log or replica style exhaust manifold/header.
- V-Band Size: 4.00" Inch I.D. / 4 5/8" O.D. (117.3mm) flat face.
- O2 Bung: With or without, select from menu.
- Exhaust Outlet side: With or Without 4" to 3" transition.
- 4.00" diameter, Smooth Mandrel Bent, Straight through race design & rainbow TIG welded.
- Made in the USA using only USA produced raw materials, superior quality.
- Lifetime warranty, guaranteed to never crack, warp or otherwise fail for as long as you own it or we will repaired to replace it for FREE.
- Lead: Built to order, this item normally ships within 1-72 hours.

The HR 004 SS turbo downpipe fits turbochargers with a 4" v-band exhaust discharge/exit/outlet & designed to be used with the 86-92 HKS Cast/log turbo exhaust manifold or HKS "Style" manifolds for the 86-92 FC RX-7. Not intended for use with any other manifold.

Himni Racing 4" stainless steel, mandrel bent, race downpipe for the 86-92 Mazda RX-7. (13B rotary engine) Designed for perfect fitment with the HKS cast/log type exhaust manifold & works with all types of external wastegates. (HKS, Tial, etc) Each one is hand crafted by HR, made of solid 304 stainless steel & features V-band mounting (turbo side) & your choice of flange on the exhaust side. Smooth mandrel bent tubing with the very minimal degree of bends for maximum flow. Very strong but lightweight with nice clean fitment.

You choice the exhaust side mounting flange that best suits your needs.
Options are:
#1 No flange left open (4" OD)
#2 4" to 3" transitioned w/ 3" V-band
#3 4" to 3" transitioned w/ 3" GT 4 bolt
#4 4" to 3" transitioned w/ 3" 2 Bolt (like the OEM 2 Bolt)

Note: This unit is intended for custom exhausts systems & is for off road & race use only.

Brand: HIMN'I Racing - Model: HR004 SS ...

Brand: HIMN'I Racing - Model: HR004 SS ...

Brand: HIMN'I Racing - Model: HR004 SS ...