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Due to the short length of the MGF/TF exhaust and the lack of middle box I think you need the cat to create the back pressure in the exhaust needed for a 4 stroke to run efficiently.
When I tried traffic light racing with a couple of decatted MGFs my catted car was quicker off the line, but that could have just been my better driving......
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Former custodian of the legend that was FE54 - RIP
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