The stupid exhaust question thread

[BigRig99]

I am going to go true duals on my truck (95 5.7 350) Would 2 1/2 piping be too big? I am going to go 8 inch glasspacks with no cats.
Thanks

 

[am92]

2.5" pipe will cost you a little bit of low end power. 2 1/4 would be ideal for close to stock motors

 

[BigRig99]

Ok so I am going to go true dual for sure with 2.25" pipe and 4" tips. But I am deciding to go with no cats and 8" glass packs, or highflow cats and no mufflers. I want it to be loud and have a crackle. Which way should I go?
Thanks

 

[RHamill]

True dual 2.25s with flowmaster 10s, no cats, dumped. Gives you a deep throaty raw sound. no ****** glasspack rispy raspy.

 

[94.Sierra]

The stock replacement y-pipe I just bought is giving me all sorts of hell and isn't fitting onto the manifold studs. I get one side on and then the other is a little off and won't line up with the studs. Anybody ran into this problem, if so how you get those ******** to line up?

 

[bluex]

Use a ratchet strap if its just a tiny but off. Any more could cause your manifolds to crack or bolts to break from the stress. If its off bad, take it to a muffler shop an see if they can bend it a little more for ya.

 

[94K1500KBAR]

Well I have a small... ok huge leak in my y-pipe right past my exhaust manifold flange. I am buying the new y-pipe Friday(of course it comes with the cat and costs more) and I want to replace the flange gaskets. Anybody have a part number or know what kind it is on a '94 4.3L? I looked it up and I expected to find a flange with 2 bolt holes(one onn either side) but found what looks like a steal core laminate o-ring.

 

[Tempted]

Well I have a small... ok huge leak in my y-pipe right past my exhaust manifold flange. I am buying the new y-pipe Friday(of course it comes with the cat and costs more) and I want to replace the flange gaskets. Anybody have a part number or know what kind it is on a '94 4.3L? I looked it up and I expected to find a flange with 2 bolt holes(one onn either side) but found what looks like a steal core laminate o-ring.

That is correct. It is typically called a donut gasket and the reason it isn't shaped like a normal gasket is because it has to allow some flex. When the motor torques, so does the exhaust. This is why you will find that most trucks also have springs between the bolts at the donut gasket.

One word of advice, start drenching the bolts in PB Blaster or equivelent DAYS before you try to take it apart. Every chance you get, douse it. You'll probably still break a bolt or two and have to drill it. Even if none of the bolts break, don't use them again. Get new ones no matter what the old ones look like. Make sure they are at least grade 8 and, if you can, replace them with studs rather than bolts. Don't overtighten them.

 

[Horns]

They make brass nuts for the exhaust flange as well.

 

[94K1500KBAR]

That is correct. It is typically called a donut gasket and the reason it isn't shaped like a normal gasket is because it has to allow some flex. When the motor torques, so does the exhaust. This is why you will find that most trucks also have springs between the bolts at the donut gasket.

One word of advice, start drenching the bolts in PB Blaster or equivelent DAYS before you try to take it apart. Every chance you get, douse it. You'll probably still break a bolt or two and have to drill it. Even if none of the bolts break, don't use them again. Get new ones no matter what the old ones look like. Make sure they are at least grade 8 and, if you can, replace them with studs rather than bolts. Don't overtighten them.

Thanks! I will pick up a few when I decide to replace the y-pipe and start drenching it daily