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Discussion Starter · #1 ·
Ok, Im going to be changing my exhaust. prob from the cat back, I want to know what is the best combo for a 360 with an auto trans, oh yeah I have a 4x4...Not sure if that would make a difference
 

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I would go with 2.5" pipes if your splitting into duals after the cat with a Y-pipe or you can do a full 3" pipe if your just running a single out. Do you plan on putting in a muffler?
 

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Discussion Starter · #3 ·
yeah, I guess i should have put that in muy orig. post, not sure what one yet Im open to suggestions, and I dont want it loud just deep and smooth
 

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go with a single 3". Will sound good and is not too large for application.
you can get too big of an exhaust pipe diameter and hurt performance.
 

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Discussion Starter · #5 ·
thanks chizzle, I was aware of loss from having too large of pipe, but three sounds good and seems to be the popular vote from others i have talked to. pluss I think it will look pretty nice too....
 

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The torque loss with too big of an exhaust is a bit of a myth. I'm running true dual 3" with an x pipe. Look at my mods, I really don't seem to have a wild enought motor to need that system. Yet, it works better than it ever has. It spins the tires wildly with a slight touch of the loud pedal. Eveything I've done to my enegine , supposedly, was supposed to cause a torque loss. It just hasn't happened that way. ANYTHING you can do to open up the intake & exhaust tracts on these motors is a plus. Don't believe evrything you hear.
 

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Discussion Starter · #7 ·
I like the Idea of 3" dual, but My truck is stock and I dont want to affect my power in a neg, way, while the myth of power being lost is not all true, you dont loose it it simply moves to a different spot in the rpm range. I think that the power you are feeling is mostly due to your X pipe, it allows one side to help pull the other while on is in intake and the other is on exhaust, it aids in the scavenging effect, thanks for the input ill consider that route
 

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i have the 360 auto 4x4, 2.5" duals after the cat, no muffler, 3 1/2" tips...all stainless so it wont rust...loud and mellow...purrs at idle and roars when i get on it...depends how loud you really wanna go
 

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Discussion Starter · #9 ·
ok I have decided to go with 2 1/2 in 3 out magnaflow, now I dont know if i want to have the pipe dump there come out the side infront of the tire or keep it looking stock and come out the stock location, what do you guys think. If you have any other ideas or ways that you have done it let me know,
 

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Discussion Starter · #11 ·
thats one for dumped
 

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dump it infront of the rear axel. cleans up the back end and sounds good echoing off the ground. Also good for ground clearance.
 

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If you want to hear it more go for infront of the axle. Dont want to hear it as much, exit behind. Farther back the less you will hear it.

I like the looks ahead of the axle, have mine there (3" single)
With headers, h/f cat and 3" glasspack it can be a bit loud @ WOT but in a good way :rck: Buddy went with dual 3" ahead of the axle and it looks really good.
Next year I plan on going with true dual 3" exiting threw the bed on both sides ahead of the axle. (fuel cell going behind axle)

If you want a bit of a cameleon, exit it in the stock location but add an electric dump right behind the cat. Best of both worlds then ;)
 

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Someone posted a chart about best size for each motor.
And 3 inch was best for the 360.
single 3" yes. dual 3" would be overkill unless the motor was internally modified a good bit w/ some type of forced induction.
Call flowmaster, they have the 'chart' you are referring to. They dyno different exhaust diameters to see what the gains or losses are. When I asked them about what to put on mine, they said 3" single or 2.5" dual.
Bigger is not always better.
 

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chizzle1 said:
single 3" yes. dual 3" would be overkill unless the motor was internally modified a good bit w/ some type of forced induction.
.
Didnt mean to confuse, single 3" best in his application.

Buddys Ram is na. Made 401rwhp old combo. My old mild 360 w/7psi made about the same. New combo's we are both working on will see him making about 450-475rw. Mine about 525-675rwhp (7psi to start then od for 12)
 

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agreed, unless your pushing in excess of 350 hp, 3" single should be plenty.

By the way: RM Indy : I am going to do a 1/8 mile pass this weekend, weather permitting, if I get you my weight and time/speed is there a way to guess-timate how much hp I'm making?
I don't know if they'll let me make more than 1 pass, but I'll try to make the most of whatever they allow me. kind of a favor a guy is doing for me.
The only thing that will hurt me is the closest thing I have to street tires are the worn 33" BFG Mud Terrains. I also have an open diff, so if I get one tire hot during the burn-out I hope the other doesn't slip on launch...or should I just stay out of the bleach and not do a burn out?

Sorry about the hi-jack.
 

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chizzle1 said:
I am going to do a 1/8 mile pass this weekend, weather permitting, if I get you my weight and time/speed is there a way to guess-timate how much hp I'm making?
I don't know if they'll let me make more than 1 pass, but I'll try to make the most of whatever they allow me. kind of a favor a guy is doing for me.
The only thing that will hurt me is the closest thing I have to street tires are the worn 33" BFG Mud Terrains. I also have an open diff, so if I get one tire hot during the burn-out I hope the other doesn't slip on launch...or should I just stay out of the bleach and not do a burn out?

Sorry about the hi-jack.
I can give you a ballpark rwhp # but you need to be accurate on the trucks weight. Peg leg could cost a bit if you cant load up the tc enough at the line without spinning. I would avoid the water box altogether with a peg leg. If you get a second pass and it spun off the line first pass, could try launching in 4wheel drive. Just make sure your lined up perfectly straight and dont steer at all. I would not try the 4wheel launch on old tires incase there are differences in the tires diameter.
Be sure to post a thread on it and good luck ;)

We now return to the original thread :D
 

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Discussion Starter · #19 ·
thanks chizzle and indy for the info Im leaning toward going with the single 3 in front on the wheel but I doo like the thought of not having visible mods, the dumped. Im not sure what way to go, Oh yeah dont worry about the Hijack, we are all here to get info however we can.
 

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Im not sure what way to go
if you get tired of the dumped setup you can have the exhaust routed over to the tire later. The pros of having a dumped setup are clearance, looks, and you can do the work yourself (no shop fee).
 
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