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I have Catted AR DPs. Here in the UK new laws means a fail on emissions if the tester spots you've removed any factory fitted cats regardless of exhaust gas readings!!
I have a JB4 tune, and have recently started to run map 1 instead of 2 (also have intercooler) mainly because at map 2 the car was able to get to liscence lossing speeds so quickly I felt the car had almost too much power for public roads. Even on map 1 I'm pretty sure I can still give a E90 M3 a scare!! So although I have no dyno figures Im pretty sure your not going to be dissapponted by Catted Downpipes!!
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