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No CELs here... I'm running the magnaflow and love it... I was honestly impressed with the performance bump. I wanted to compare with the bmw pe but I tuned my car before I was able to go head to head with one... The only drawback I see to the magnaflow is that it's too quiet for my taste (don't go by initial start up it gets louder about a week or so into it)... But I say go for it... It's half the price and actually replaces the resonator and piping back to the secondary cats (which I might gut to get a little more performance and sound) bmw pe is just an axle back
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