Quote:
Originally Posted by STR8-6IX
Quote:
Originally Posted by chillp
I've been running the full ESS exhaust with HFCs for over two years and no CEL. I used the system for over a year without the ESS tune (so that's not the reason for not getting a CEL). Good luck!
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is the test pipe a primary or secondary cat delete?
messing with your exhaust PAST the primary cats and o2 sensors will not yield a CEL, and you dont need an ECU tune.
eg. deleting your secondary cats = no CEL. the ECU will adjust to the mod within 350 miles on its own. no tune needed. |
The full ESS system replaces the stock x-pipe with one that has HFCs (in place of the more restrictive cats), no secondary cats, and two resonators (you have the option of choosing an x-pipe with 4 resonators instead of the HFCs, but that's not my setup and that will certainly throw a CEL). Some have said that the HFCs will eventually throw a CEL, but that hasn't happened yet with my ESS system.