Flowmaster quality, very nice. Anyone who thinks that these catalytic converters "trigger the check engine light" is wrong. The only reason the check engine light (CEL) will come on after installation is that your vehicle is not designed or configured to use high flow (200 cell) catalytic converters. If your vehicle cannot use high-flow chokes, the check engine light will be on because they were fitted to the wrong vehicle, not the coils themselves. This is a "universal fit" but not a "universal application". Again, your vehicle must be able to use high flow catalytic converters in order for them to work and not have CEL lights. If your car can support high-flow catalytic converters, you should be in tip-top shape and they will serve you well. .
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