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Message: <blockquote data-quote="bindablitz" data-source="post: 2532" data-attributes="member: 283"><p>I was at my workshop for regular maintenance and came about an article in one of the BMW only magazine.Apparently the early genre BMW engine 2.0L, 2.5L and 2.8L came with restrictive manifold to control the hp to adhere to some local tax in Germany. It was written that the 2.8L came with a 2L manifold.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" /> Subsequently the later 2.2L, 2.5L and 3.0L came with bigger manifold thus the increase in hp and etc... I am just wondering if anybody has tried to change the manifold for the early genre restricted engines?I was told removing the Cat converter and replacing it with a free flow proper center exhaust will make a difference in response and power. Any comments?Anybody has tried the approach above? If not mistaken it applies to E46 and E39 mainly.</p></blockquote><p></p>