'55 Chevy 3800 Cummins

[xj_man_646]

Originally Posted by 6DoF

oh man, i'll never go back! i love it!

Yeah, I haven't touched anything since Catia in the 2008-2009ish timeframe. Its been awhile to say the least

[xj_man_646]

[QUOTE=jeepkid05;63886]IMHO 5

[xj_man_646]

Originally Posted by jeepkid05

IMHO 5” is the only way to go on a Cummins. It sounds like a big rig.

https://www.youtube.com/watch?v=UV6H9uBprFk

See 1:27

[nblehm]

It sounds like bigfoot farting into a large trash can for a long time


I am getting old give me quite exhaust.

[Cobound]

Originally Posted by nblehm

It sounds like bigfoot farting into a large trash can for a long time


I am getting old give me quite exhaust.

Ditto!

[jeepkid05]

Originally Posted by xj_man_646

https://www.youtube.com/watch?v=UV6H9uBprFk

See 1:27

I love those.

[xj_man_646]

I do too. There was a funny one about building a KOH buggy; I can't find it now.

[6DoF]

Originally Posted by xj_man_646

https://www.youtube.com/watch?v=UV6H9uBprFk

See 1:27

[jeepkid05]

This was one of the first ones I saw

https://youtu.be/S-BGIcRBPHM

[6DoF]

more 5" exhaust showed up to trigger James, this time the 2nd most recommended muffler to quite a diesel, a Donaldson muffler. now i went with a shorter version though since i don't quite have the room, so 20" body vs the 44" most ppl get for a ram. this is an M090595 with 5" in and out.

straight thru design, but then you can see the baffle right smack in the middle. i guess if it's too quite i can just start drilling holes in that.

the rear fenders are about 13" wide, and this can is 9" dia plus at least 1" off the bed side, so i'll still be at least 3" inside the fender lip with this side pipe. don't forget that i'm making the whole bed wider to get around the duals vs just wider fenders.

[6DoF]

while i've been plotting exhaust and ordering parts, i've also started to figure the trans tunnel. i think i'm going to commit to the bent plate vs rolled look.

[xj_man_646]

Originally Posted by 6DoF

straight thru design, but then you can see the baffle right smack in the middle. i guess if it's too quite i can just start drilling holes in that.

I'm curious to see how it turns out, but I really really do not think you'll have this issue

[6DoF]

Originally Posted by xj_man_646

I'm curious to see how it turns out

me too!

[nblehm]

I am not liking the direction of the exhaust so far, but the rest of the build is turning out sweet so I will trust the process.

[6DoF]

Originally Posted by nblehm

I am not liking the direction of the exhaust so far, but the rest of the build is turning out sweet so I will trust the process.

is there anything specific that's messing with your eye/head more than another?

i chose the 5" for the deeper tone that'll be less expected, and higher flow if/when i build this thing out. the resonator under the cab won't be seen, then the muffler side pipe will fit between the cab and the wheel house with the wheel house being wider. off the back of the muffler will be some kind 45 out and probably a "teardrop" style cut pipe for the tip. since the law requires a heat shield, i'll most likely just use a TI wrap. i'll wrap everything turbo to back of the cab anyways. a little ratty, a little street-rod, something different. plus having the muffler and resonator should keep things "quiet" but sound nice, especially with the tip at least 4ft behind the cab.

as for black smoke on the fender, that's just proper rat .

so i got to talking to a buddy who also isn't thrilled with my side pipe, he was suggesting (demanding) a y-pipe and splitting the 5" into dual 3.5" pipes out the back. can't go under the axle b/c of the travel, and with the bags, shocks, cross member, WATTs link, and the giant 14b housing ... i just can't without some major re-engineering.

best case probably would be to put 2 4" ID tubes thru the 3" shock cross member and reinforce it. from the mufflers under the cab a full 90 up and full 90 back to get over the suspension mount, then the Y, then thru the cross member holes outside the upper shock mounts, then full 90 dive straight down between the axle and WATTs, and another full 90 under it to go out wherever. physically possible, but shatty.

[xj_man_646]

For what its worth, side exit in front of the rear wheel started to destroy Hubble's aluminum wheel finish with his super duty. It might have been polish-able, but I don't think he ever got that far. Not sure if that could be an issue with the black wheels or not.

Can you set the axle at theoretical maximum bump height with tires installed and see how much clearance above the axle you have (could be just me but it appears that the axle would never bump that far with tires installed and the truck laid out on the frame)?

[6DoF]

Originally Posted by xj_man_646

For what its worth, side exit in front of the rear wheel started to destroy Hubble's aluminum wheel finish with his super duty. It might have been polish-able, but I don't think he ever got that far. Not sure if that could be an issue with the black wheels or not.

Can you set the axle at theoretical maximum bump height with tires installed and see how much clearance above the axle you have (could be just me but it appears that the axle would never bump that far with tires installed and the truck laid out on the frame)?

the u-bolts hit the frame, that's the bump. i specifically build the frame to that point. the level in the pictures is taller than the bed floor support rails, the bed floor will be right on the top of the 14b, coming up between the supports. don't forget the 4 air bags that are 8" diameter missing from the pictures too. my goal was to get the bed floor as low as possible to have as much bed depth as possible to still be useable. i had also always planned to just have a turn-out from behind the cab, but have since decided to add the second muffler instead of having a bed side step on that side.

the axle tube is 1" above the bottom of the frame at full droop. going low and fitting a ton of big steel in a small space.

[xj_man_646]

Where does the axle sit in this picture? Is it actually that close to the bump position shown above?

[6DoF]

[xj_man_646]

Yep, you don't have much room.

Better just hood stack it.