Mod Details
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![452 Roadster 452 Roadster](https://www.evilution.co.uk/wp-content/themes/evilution/images/evilution/model7.png)
Remove the rear panels, this can be found here. Remove the crash bar using a Torx 45 screwdriver.
![](/wp-content/uploads/smartengine/lambda/2a.jpg)
There are 2 nuts holding the exhaust to the turbo. These can be removed with a 13mm or 1/2″ socket. It is a wise idea to spray these with penetrating oil over the preceding few days to help loosen the nuts.
![](/wp-content/uploads/smartengine/exhaust/450/2.jpg)
Due to the access, it helps to have thin extension bars and a universal joint.
![](/wp-content/uploads/smartengine/exhaust/450/3.jpg)
This is the Roadster exhaust lambda sensor. Spray it liberally with penetrating oil (no, not WD40).
![](https://www.evilution.co.uk/wp-content/uploads/smartengine/exhaust/452/452ex1.jpg)
The connector is the left one of the 2. Disconnect it so the wires don’t twist as you unscrew the sensor next.
![](https://www.evilution.co.uk/wp-content/uploads/smartengine/exhaust/452/452ex2.jpg)
Ideally you’ll use a proper lambda sensor removal tool, it’s a 22mm slotted socket…
![](https://www.evilution.co.uk/wp-content/uploads/smartengine/exhaust/452/452ex3.jpg)
…that allows the wiring loom to poke out the side, out of the way.
![](https://www.evilution.co.uk/wp-content/uploads/smartengine/exhaust/452/452ex4.jpg)
You can also use a 22mm ring spanner. Don’t use standard open spanners. They slip.
Roadster Exhaust Weight
This is the weight in position.
![](https://www.evilution.co.uk/wp-content/uploads/smartengine/exhaust/452/weight1.jpg)
It’s just a hard rubber block with a pointless metal bracket.
![](https://www.evilution.co.uk/wp-content/uploads/smartengine/exhaust/452/weight2.jpg)
The smart part number was 0018938V001000000 but I doubt these are available any more.
You will probably have to make your own. It weighs 420g (14.8 oz).
![](https://www.evilution.co.uk/wp-content/uploads/smartengine/exhaust/452/diag.jpg)