Thread: 335i ar-design downpipes on e89
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      02-18-2014, 01:33 PM   #4
Lambobimmer
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Drives: 2022 X3 M40i, 2018 TTRS
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AR makes a Z4 specific design and they fit perfectly. Maybe you lose power without a tune but I cannot understand why you would install DP's without running a tune.
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