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Yes - you will only gain performance if you do a straight through pipe to the back box but in addition you will only get this with fueling changes - without a cat the engine flow characteristics have been changed dramaticaly - the pre set fueling curves that the ECU uses when it's not in closed loop ( during acceleration and WOT) will be wrong - you may need to have it rechipped or add an RRFPR to add the extra fuel needed.
posted by 195.102.197....
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