Should I Keep AIR and EGR???????
Personally I say keep the EGR and the CATS, on a correct setup the cat's will not loose you any noticable power loss.
And EGR does not affect power, but it does lower combustion chamber temps, which arguable can help to minimise the risk of detonation.
AIR, will be needed for some CAT types but not others, so it depends. It's certainly not causing any harm though.
Plus all that stuff looks crappy, and some of the times you can sell it.
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