Failed the NCT

[johnk555]

bugeye failed the nct yesterday on emissions tester said it could be my big exhaust (blitz nur spec)
should i use diptane for the retest?
Engine temp 83c

Low idle 710 rpm
C0 0.04 vol%
Hc66 ppm
PASS
High idle 2750rpm
Lambda1.16. Not between 0.97 and 1.03. FAIL
C0 0.07 vol%
Hc 30 ppm

 

[wagon dec]

You have :an exhaust leak somewhere man too much air in the readings thats why lambda is high