Quote:
Originally Posted by saltywetman
From a quick search I can find that APEXi, HKS, and fujitsubo offer catfree header -> front pipe systems with high flow catalyzers in the front pipe. However, APEXi seems to be the only manufacturer that bothered to relocate the second O2 sensor to after the high flow cat.
Anyone know why HKS and fujitsubo didn't bother to relocate the sensors? From the experiences shared by APEXi owners, they did not get a CEL after installing their system.
Is it because all header upgrades should follow with a tune which will take care of the CEL anyways?
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Ideally you'd get a tune.
Having the O2 relocated to after the secondary cat is no guarantee you'd get no CEL. Most that don't relocate just provide you with an O2 spacer.