Interim exhaust catalyst pipe - a bypass for the CAT?

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jeffhallifax
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Interim exhaust catalyst pipe - a bypass for the CAT?

Caterham supplied this from new on the car which I have recently purchased but seem unable to explain what it actually does!  Can anyone shed any light?

Jeff                                        

Wrightpayne
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Basically an extra bit of exhaust piping which replaces the catalyst section straight after the MOT. Usually 4 into 1 style pipe.

Wrightpayne
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Here are the two Sigma exhaust parts taken from the Caterham Parts website which show the principle....

CtrMint
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Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
ScottR400D
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I fitted one a couple of years ago. No difference in performance as far as I can tell but presumably saves the cat. 

I just swap back and forth for the MOT, it's pretty straightforward though I’m not sure if it’s necessary!