Since nobody has taken the liberty to put together a thread on the slant six exhaust and a place for people to give their input from what they have done to their exhaust and what they like and dislike about it, i figured id start one since lately it has become a common topic. My goal is to have a thread with much input from fellow slanters that has opinions, questions and videos of different setups so that we have somewhere to link to when the topc comes up. This way we arent telling people to search it and have them come up with tons of results that they have to read through, which can be rather intimidating.
Ill give my opinion on different ways ive done my exhaust and ill try and post some pictures and videos of each setup ive done, which is too many
Stock Manifold Exhaust:
Ive done many setups with the stock manifold.
1. After passing DEQ when i got the truck i cut the tailpipe off. It added a little bit of sound but it also added drone, which in an old truck with no insulation is rather annoying.
2. I cut the muffler out and half way gutted the original clogged up cat, a little more noise a little more drone.
3.Redid my exhaust and put a 2.5" system on from the manifold back with new cat and a flowtech redhot glasspack with a turndown. Louder than #2 but a lot more drone since i had made my own cut out that leaked a bit. I drove around for quite some time with this setup about half a year with it i switched to a flowtech raptor turbo muffler which further quieted it but still droned.
My take on turndowns, theyre great for a drag car or weekend cruiser, but on a DD. They really suck! unless you have lots of insulation it is going to drone no matter where it exits under the car. If it exits under the car and isnt pointed out from under it with the tip at least 4" away from the edge of the sheet metal, it will probably drone. I say 4" because my current tip is about 3" away from the edge and it doesnt drone.
Dual Exhaust:
I got a set of dutra duals and i love them. With my old tired engine they really woke it up! They look great and i still get the heat riser function which will really be nice when it gets colder!
It seems like a lot of the people i see asking about running duals want to run true duals with an x pipe or H pipe. Well like most of the more knowledgeable guys on the board will say, a good flowing 2 into 1 exhaust will be much better and save weight. What i did with my dutras is I ran 2" pipe off the manifolds into a Y that goes into a 2.5" exhaust through a cutout then into a cat a glasspack and my raptor turbo muffler, a 4' tailpipe with turndown angled out in front of the rear passenger tire. There is no drone, I have a nice quiet idle, under normal cruise around town (under 2k) it has a nice mellow deep tone that sounds great. On the upper end (3k+) has a slight slant six rasp but not too bad. Its louder than a modern car but doesnt drone and sounds good. With my cutout open i get the full slant six split manifold sound, which might i say is awesome! 1 bolt i pull the cap off and it goes from a nice purr to the swarm of bees
Nice kinda deep idle, very throaty under 2k, between 2-3k it transitions from throaty like a v8 to raspy, kinda like those old jag inline 6's and over 3k you get that slant six swarm of bees sound which sounds like a really big swarm 
But since my cutout exits under the passenger floorboard you can believe it drones like crazy when its open Overall I preffer the dutras over headers, they were a little hard to plumb with a low mounted starter but they just sound cool and im not worried at all about them rusting like headers would, eventhough they dont use road salt in Oregon. n top of sounding cool my truck has gained signicant performance even with the stock 1bbl. I can now accelerate up hills and i have way more power in the upper end to pass on the freeway and can cruise at 65mph with very little throttle, in fact i get about 16-18 in/hg on my vacuum gauge at 65mph going down a flat freeway and can still keep over 10 in/hg while passing. Before those numbers were 12 in/hg and 5 in/hg respectively. With no other modifications.
I know i said in the beggining that i have done too many variations, but only listed a few. I have done much tinkering whith my exhaust, clamping pipes together to see what sounds good and what doesnt. Its late and ive had a long day. If anyone has any questions feel free to ask. If i dont have an answer for you, im pretty sure that there will be someone who can answer it for you. I will post pictures and videos (bare in mind most are cell phone videos so not the best sound quality) soon. I will try and take a video of my new exhaust with our good camera when i get the chance.
Hope this helps a lot of you,
Cody