Get Adobe Flash player

Rotary Mufflers

These mufflers and resonators have been developed by a continuous r&d effort. They have a quieter, deep sound. The muffler housings are constructed from mild steel tube and spun ends. They are fully externally tig welded for maximum strength. The internal perforated tubes are 409 stainless steel. An additional feature is an expansion joint in the perforated tube to allow it to expand and contract without causing fatigue and eventual failure in a very hot rotary exhaust environment. The perforated tube is wrapped in a thick layer of INOX( stainless steel wool) . This provides a heat barrier between the perforated tube and the packing. The packing is either high temp. rockwool ( 750 deg C) or high quality stranded fibreglass (700 deg C) when INOX is wrapped around the perforated tube. I prefer fibreglass in most circumstances because it appears to be more tolerant to carbon deposit which tends to make mufflers noisier. Where sustained full throttle application occurs I prefer rockwool which has a higher temp capability. It is important to tune the engine correctly and not run too rich which produces the carbon deposits in the muffler. These mufflers and resonators due to the expansion joint, with some effort , can be repacked if required giving it a second life. The resonators are fully packed with INOX in most circumstances.These mufflers and resonators are also suitable to fit to most high performance vehicles. For example Mitsubishi Evo, Nissan GTR, and Subaru WRX where less noise and high flow is required. Custom sizes are available on request.

 

Active Exhausts

Stage 1 Information

Stage 1 Active Exhaust System kit is a more simplified active exhaust which minimises drones and quietens performance exhaust systems in cruise and free rev mode conditions. It is controlled by an in-cabin switch which is usually swithced from closed, low floe (quiet) to opem, high flow (noisier) exhaust when required. The idle sound is also adjustable on the butterfly provided. The butterfly is usually fitted near the rear suspension. The 3" version can also be fitted to the 2 1/2" exhaust systems by expanding the pipe to fit. Same with the 4" version when fitted to 3 1/2" exhaust systems.

Components: Butterfly assembly with flanges, gaskets and bolts.

Vacuum solenoid complete (low performace).

Boost proof check valve.

2 position switch. 

L.E.D.

Hose clamps.

Instructions.

Fuse Holder and 5A fuse.

2 lugs.

Stage 2 Information

Stage 2 Active Exhaust System kit is a more simplified active exhaust which minimises drones and quietens performance exhaust systems in cruise and free rev mode conditions. This version can be controlled by an aftermarket ECU e.g. Haltech, Motech etc. One example of control is to program the butterfly switch from closed or almost closed position (quieter, low flow) to full open position (noisier, full flow) at 1 lb/sq" and 3000rpm. Whatever one desired. Also an in-cabin switch can be fitted to manually switch the butterfly to high flow, open position manually. The idle sound is also adjustable on the butterfly provided and is usually fitted near the rear suspension. The 3" version can also be fitted to the 2 1/2" exhaust systems by expanding the pipe to fit. Same with the 4" version when fitted to 3 1/2" exhaust systems.

Note: this kit comprises free rev noise reduction for drivability.

Components: Butterfly assembly with flanges, gaskets and bolts.

Vacuum solenoid complete (high performace).

Boost proof check valve.

3 position switch. 

L.E.D.

Hose clamps.

Instructions.

Fuse Holder and 5A fuse.

3 lugs.

Stage 3 Information

The stage 3 kit is unique in it's operation. The result is similar to that achieved by bimodal mufflers but in a different way. The purpose of the stage 3 exhaust is to give a high performace, straight through exhaust a dual personality. i.e. lower performace, quieter, drone free mode and a high performace, noisier mode. It is self - intelligent i.e. changes from one mode to the other as performace requirements change. This is normally achieved by TPS and/ or RPM switching is available with ECU used. 

If there is no TPS used such as on a carbureted engine, then a micro - switch can be used. In simple terms it can be adjusted to provide maximum exhaust flow at say 100% throttle and 3000rpm or whatever calibration required or maybe just 100% throttle. It is your choice. Normally TPS switching is used alone for simplicity. When in low perfomace mode it regulates the exhaust backpressure to a dialed figure, usually 2.5 lb/sq". The maximum back pressure available is 5 lb/sq". TPS switching can be adjusted between 40% and 100%. The kit comes complete with an in-cabin switch and LED to indicate when the control unit is regulating. The switch has 3 positions.

1) Fully open butterfly giving maximum exhaust flow.

2) Self - intelligent

3) Fully closed butterfly

Note: even when butterfly is in the fully closed position there is some flow through which is adjustable. The LED indicates regulation when flashing and full open exhaust when on. This concept is similar to an electronic waste - gate control system except vacuum instead of boost is used to control the actuator.