just bought PLM headers from ebay
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I did the opposite.. I have large long tube headers, race cats and stock mufflers and resonators.. Make huge power, great sound under throttle and nice and quiet at cruise!

E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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These were without doubt the worst designed headers that i have ever seen, obviously designed for ease of manufactured with no consideration to balanced ports, back pressure or air flow. The port entries were actually smaller than the OEM manifolds.
The ebay picture showed headers which appeared to be a reasonable design but they were not the ones I received. I later found out the picture was of the 55 headers.




