Jeff210R Posted October 9, 2020 Share Posted October 9, 2020 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 Link to comment Share on other sites More sharing options...
Wrightpayne Posted October 10, 2020 Share Posted October 10, 2020 Basically an extra bit of exhaust piping which replaces the catalyst section straight after the MOT. Usually 4 into 1 style pipe. Link to comment Share on other sites More sharing options...
Wrightpayne Posted October 10, 2020 Share Posted October 10, 2020 Here are the two Sigma exhaust parts taken from the Caterham Parts website which show the principle.... Link to comment Share on other sites More sharing options...
CtrMint Posted October 11, 2020 Share Posted October 11, 2020 https://www.caterham7diaries.com/post/caterham-7-420r-decat-install just installed that myself. Link to comment Share on other sites More sharing options...
ScottR400D Posted October 11, 2020 Share Posted October 11, 2020 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! Link to comment Share on other sites More sharing options...
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