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HFC or no cats makes suuuuch a big difference in power, response, sound, etc. Love em! I told myself I would never get aftermarket exhaust again without doing something with the cats because the difference was that huge.
 
Would removal of cats cause a small spark when releasing the gas after WOT

Sent from my SGH-T999 2
 
No, if I remember correctly that happens when cars are fixed up and they need bigger injectors for fuel and some of that fuel doesn't get ignited in the engine and when it hits the heat of the exhaust that's where the flame comes from. Or I could be completely wrong....:p

Sent from my HTC 2
 
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