TR250, 5, 6 Exhaust System comprising: - 6 into 1 Extractor Manifold (RTR2044), and Exhaust System (RTR2045) all manufactured from stainless steel with a main bore internal diameter of 54mm.

The system has one silencer orientated fore and aft exiting with an up-swept tailpipe. The extractor manifold consists of a front 3 into 1 manifold, a rear 3 into 1 manifold and a Y piece.

The extractor manifold weighs 5.4 kg, a significant saving over the cast manifold which weighs 6.8kg and the extractor manifold effectively includes the down pipes too.

This exhaust system is generally considered the most efficient manifold/exhaust combination available. When first tested a 25hp increase in power was achieved with this manifold (RTR2044) and its associated exhaust system RTR2045 which together form this complete system (RTR2042). No other modifications to the engine were incorporated at the time.
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 surrounding terrain affect the noise output (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 95-98db; specifically 97db at Castle Combe  rasce circuit.


This exhaust system benefits from substantial mountings, ensuring it stays in place longer. There is a support bolted to the rear gearbox mounting (non-overdrive and 'A;' type overdrive and to the rear overdrive casing where the standard system is supported on 'J' type overdrive cars) a double mounting is clamped around the rear chassis cross brace.

We are often asked, as the tubing is 54mm (2-1/8") Internal Diameter, 57mm (2-1/4") External 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. We recommend 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
This complete system with its single silencer gives a ground clearance of approximately 150mm with wheels of 300mm rolling radius fitted and standard springs. Recently redesigned, this kit is now quieter, incorporating a smaller 54mm bore main pipe and larger silencer. These improvements have been carefully designed to reduce noise without interfering with performance.

Please order the appropriate Fitting Kit separately. See below for linked parts. One photograph shows a fitting kit with the exhaust system for reference only

Our TR250,5,6 exhaust manifold and system was devolved for RevingtonTR by Mike the Pipe in Croydon in the late 80's. At the time he was renowned as THE exhaust specialist. The first set was fitted to a friend's TR6 fitted with a smooth recently built standard TR6 engine. We tested the system on a local rolling road first (we didn't have our own then); fitted the system then rushed back to ensure the atmospheric conditions where identical. The second rolling road test revealed that the new manifold and system had increased the power by 25hp with NO decrease in torque. If fact an increase was observed.

Since then our system has been much copied, some copies detracting from the original concept to enable aftermarket inlet manifolds to fit amongst other reasons, thus robbing power. Our system is still a true facsimile of the original design although made in stainless steel now.

This part is listed on the following pages of the website, where further information and background reading may be found.

Exhaust systems » STAINLESS STEEL EXHAUST SYSTEMS
Our TRs and workshop activity » Exhaust Systems

Readers' Drives » Engine rebuild
Readers' Drives » Suspension
Readers' Drives » Exhaust systems

Q: Can I use an Extractor Manifold RTR2044 part of system RTR2042 with a triple Weber inlet manifold RTR4008 and RTR4008-1