I have a 5.9 i bought with R/T heads, mopar performance ZUES intake manifold. It has a spun bearing so i tore the motor apart for the machine shop and found there was no plenum pan. My truck currently has a 5.2L that pings on loads and acceleration which is typical due do to the plenum pan gasket blown out. I am familiar with that repair. My question is, do the 5.9's have a plenum pan and gasket like the 5.2's? And if so, is it even necessary to install or can you do without.