help identify a noise, plus some other ?\'s I've been driving my new CUCV for a couple of days now, the first couple days it sounded normal, just your typical diesel, all I did was change the oil and the airfilter. Now it has a big base sound(sounds like you have the aircleaner lid upside down in a big block Chevy with your foot on the gas)Can't hear each other inside the truck anymore. It does need a new exhaust but I didn't see any leaks. Where's the best place for a new exhaust, like an aftermarket setup or some NOS? The noise seems to be under the hood and almost immediately when you give it gas. Also looks like it has a small front lower pully(crankshaft)leak, unless this is just the front lip of the oilpan, how hard of a job would this be to tackle? Which book would be best to help me out with future problems? Thanks for any info.