So Ive done a lot of searches on here and found a few things. On the Dodges a lot of peoples cats have gone and a lot of people have replaced their plenum gasket due to poor design by chrysler. My truck is a 95 5.2 with 93000 mi. The other day I was on the freeway and I went to speed up from 60 to 65 and I got a sort of bogging from the engine. The harder I pushed the accelorator the louder the roar but I didn't go any faster its like I had a huge power loss. Also Ive been noticing when I start the truck in the morning, there is an anoying rattle coming from the catalytic converter, and when I gas it the rattling gets worse then subsides as the RPMs drop. Also at my last few oil changes Ive been burnin about a quart every 3000 mi. Do you guys think I should try and just replace the cat and see what happens or should I go ahead and do the plenum gasket?? By the way I coulddn't find anything on how in depth a plenum gasket install was. It doesnt seem like its very deep in the motor, Ive done a head gasket before so I'm guessing this is less difficult than that. Sorry for the long post but wanted to give an accurate description of the symptoms..