Quote:
Originally Posted by mrg666
FYI: CARB tune is running fine with my catless HKS dual resonated front pipe and 2017+ stock header since almost a year. More power at high rpm and more mpg with normal driving, and no CELs.
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I'd be interested to see what the actual effect is. I suspect the concern is that it would cause greater exhaust flow to a level that affects air/fuel ratio and causes many minor knock events. Conceivably the computer could be automatically pulling timing out to compensate... But it's also possible I have no idea how the ECU actually works.
It seems like an unnecessary risk with questionable reward.