Quote:
Originally Posted by 6IX-F10-N52
best to just take those out before they shit themselves.. good engine sound, deeper exhaust tone and good gains+ throttle response above 4000RPM.
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Holy thread revival
What makes you think they'd shit themselves? They have a less dense cell count than the primary cats so less likely to get clogged. Our engines have perfect closed-loop fuelling so they're always running sensible AFR as long as your tune isn't crap so no clogging from overly rich mixtures. They're a sufficient distance from the engine that they won't be damaged from heat.
Do you have any evidence of the good gains and throttle response above 4000rpm from removing the secondary cats?