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Yea that's the only thing that iv changed and this happened right after i got them installed so must be something with the downpipes i hope that's all it is. Gonna bring it back to the shop and let...

Hey guys i just had my AR design catless DP's installed on my 335xi and couple things going wrong. 1 is i always had a little rattle on my car thought it was the waste-gate rattle, never really...