Hello there, I am currently replacing my stock exhaust in my 75 280s W116. I removed the Thermal reactor thingy and I am installing euro manifolds..my question is should I do a Y-pipe type of system or run dual pipes into a dual pipe resonator and dual pipe muffler like I seen on the 78 79 M110's installed in the w123 chassis cars. I don't know how a true dual exhaust would sound and I remember reading somewhere that this motor needs a certain amount of back pressure or it wont have any low end power..I'm not sure how big the factory piping is but it appears to be less than 2 inches.. I don't want it totally quiet, I'm looking for a nice hum at the tailpipe.. Anyone who has a M110 in their car and has done the exhaust your input would greatly help me..