This system consisting of our four into one extractor manifold, rally style exhaust system (all manufactured from high grade stainless steel) and fitting kit has been designed to sit as high as possible in the chassis, the two silencers (sitting one behind the other) are connected by a long sleeve and springs rather than clamps, so that the systems joints can slide in and out should they get knocked, rather than come apart and stay apart. The arrangement is engineered such that the predominant gas flow direction eliminates the chance of leaks.

To further reduce the possibility of inadvertent disassembly, the boxes have skids on their leading edges. The rear box has a skid on its trailing edge too. We use this system on our own Rally Cars, although it is used on hundreds of road cars too and whilst the gas flow is excellent the system is not noisy. The system is regularly noise checked at races, sprints and Hillclimb circuits throughout the UK and whilst the surroundings affect the perceived noise (in a built up area where there will be reflected noise whereas the exhaust will seem quieter in an open field), the system regularly measures 93-95db; typically 93db at Castle Combe October 2011.

The manifold is designed for maximum flow; as a result the 4 pipes are arranged in a 'square' configuration. Pipe no. 2 can touch the chassis flange; it therefore may be necessary to grind away the chassis flange to afford 5mm clearance around the pipe. Please be prepared for this when ordering this manifold.
The outlet has an internal diameter of 54mm (2 1/8"), an outside diameter of 57mm (2 ¼") and all pipes are mandrel bent to maximise gas flow (Mandrel bending does not reduce the pipe cross sectional area [CSA] at the bend where as ordinary bending reduces the CSA considerably impeding gas flow).

The exhaust is a straight through system with two silencers. The pipes have minimal bends to maximise gas flow and where bends are necessary, these are mandrel bent to further assist gas flow.

Our rally exhaust system benefits from substantial mountings, ensuring it stays in place longer. To ensure these mountings work properly the supports must be welded to the chassis, one below the axle and one onto the rear cross tube. Please be prepared for this when ordering this exhaust system.
We are often asked, as the tubing is 54mm (2 1/8") Internal Diameter, 57mm (2 ¼") Outside Diameter, will this tubing fit through the boxed-in section of the chassis frame under the gearbox (transmission) without modification or is modification necessary?
Yes the pipe will fit through the chassis frame, but clearance is tight. If you have the opportunity whilst fitting the exhaust we recommend opening out the box section to allow extra clearance and/or wrapping the exhaust with exhaust wrap to reduce the possibility of rattling as the exhaust settles over time. Also, whilst fitting the manifold we recommend wrapping with exhaust wrap to reduce heat in the engine bay. Order exhaust wrap RTR2114 or RTR2115. See below

NOTE: TR2-3 owners with low port heads will need to file out the mounting holes slightly to utilise this extractor manifold as it is specifically intended to fit a high port head. We have however successfully fitted the manifold to low ports heads, with the ports lined up correctly in our own workshops.

This manifold cannot be used with a TR2-3 bomb type starter motor fitted, but is fine with the later bendix type starter motor found on TR3A-4 and by now retro fitted to many TR2-3. If necessary order a geared starter to suit, see below and section 8 'Electrical Systems' of our catalogue and web site for suitable units.
The manifold will fit with the original generator (dynamo) and most common alternators.

NOTE: This manifold cannot be used with a TR2-3 bomb type starter motor fitted, but is fine with the later bendix type starter motor found on TR3A-4 and geared starters by now retro fitted to many TR2-3. If necessary order a geared starter to suit, see below and section 8 'Electrical Systems' of our catalogue and web site for suitable units.

The manifold will fit with the original generator (dynamo) and most common alternators.

For TR4A see RTR2006K