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      06-04-2012, 04:41 AM   #7
Aussie_in_London
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Drives: 1M, i3 & track built Astra OPC
Join Date: Apr 2011
Location: Kent

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Remove some of the restriction by removing the 2 secondary cats, which is a good thing for improved throttle and some performance, main gains will be main cats on the downpipes but then you will need to be mapping to change the sensor perimeters or you face the eml flashing up, otherwise with some miles now I have found it has deepened the exhaust note especially the burbles which from the outside is very noticeable.....simple and easy, looks oem and cheap to do.....