If you plan to pass emissions AND have a nice clean install that will last and be reliable then your best bet will be to get CSL manifolds and section 2.
Other options consist of poorly made china parts that will fall apart after a year.
It'll set you back about $1700-2000 plus about $500-700 for install.
You will gain 11rwhp at upper RPM range, have a much nicer , raspier exhaust tone. Your wallet will also drain about $2500 but your E status will go thought the roof.
If you need help with getting OEM CSL manifolds, let me know