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Message: <blockquote data-quote="dealmaker" data-source="post: 558731" data-attributes="member: 23940">Bro,1) I had the same problem when I do the checking to upgrade the exhaust for my car. Many mechanic say it's ok but the exhaust is not bolt-on to our model..you have to cut the pipe and joint the exhaust. This is for BMW performance exhaust and eisenmann. Many experience loss in low end torque due to this mods from my reading from the nets. Until today, I still use the original exhaust as I prefer bolt -on rather than cut& joint the muffler.2) Please check with your Tuner.3) Have you try to visit custom pipe shop and seek their advise about this?</blockquote>