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Message: <blockquote data-quote="seancsy" data-source="post: 748366" data-attributes="member: 51046">Everyone who has swapped engines went for upgrade, and I think I may be the only one who has opted for a downgrade.My E39 530i suffered overheating and mechanic suspected engine block may have cracked because engine oil flooded the cooling system. On the advice of my mechanic, I decided to swap the M54B30 for a M54B25. The mechanic did only the engine swap.I have been driving the car for one week now and I am facing several issues:1) The car feels sluggish (of course there is 40hp less) but I have driven my brother's E60 525i with M54B25 too and it's definitely more powerful.2) The gear shifts are also less responsive when I stomp on the accelerator. The responsive nature of a BMW automatic gearbox has gone.3) The engine vibrates at certain combination of RPM and car speed. I have yet to pinpoint and emulate the problem.I told my mechanic that there are stuff to be re-programmed from what I gather from several forums. He says these are beyond his capabilities and I am now stucked.Hope someone can advice where I can get the DME or even the EGS re-programmed to suit the M54B25 engine.Thank you very much.Regards,Chung</blockquote>