metal slinger
NAXJA Forum User
- Location
- North West
I have had one of these manifolds for over 20,000 miles and put it through hell and back without any problems. Let me explain........
If you want to waste your time and money and get something pretty go ahead and get one of those brand name garbage manifolds. If you want something that is going to last you need to stop hesitating and get one of these. The factory manifolds and the brand name ones are all made with the same steel and roughly the same design principles. The APNs are made out of 321 stainless. The same steel that is used on aircraft exhaust manifolds, furnace parts, heat exchangers etc.
This grade is stabilized with titanium thereby making it highly resistant to intergranular corrosion (weld decay). Want to know why the Brand Name Manifolds will not use this stuff? Cause you cant polish 321 stainless and it is all about looks and advertising with them. Your exhaust gases will not and I repeat will not phase this kind of steel. Think about it for a moment........they use this stuff on Jets and Furnaces...etc.
The rate of expansion and contraction on the 4.0s combined with 409 stainless (on the factory and even brand name manifolds) and the exhaust gases breaks down the molecular composition of the steel thereby causing this intergranular corrosion(again...weld decay). Want to know why all your manifolds are cracking at the welds? Well then......there is your answer.
Save your money and buy one of these and if you want, pick up some exhaust wrap from Summit or something and that will forever be the end of your manifold problems. I personally would run these without any coating of any type as this grade of steel is resistant to rapid temperature changes. If you really need a coating on them just hit the mud a little harder
There you go.......blow that out your pipe
Ohhh Yea.....One more thing....409 stainless is really a garbage grade of steel. Spend enough years working with 321,409,301, etc in corrosive enviroments putting this and many other kinds of steel through hell and you shall arive in the same boat (maybe different name...lol)
If you want to waste your time and money and get something pretty go ahead and get one of those brand name garbage manifolds. If you want something that is going to last you need to stop hesitating and get one of these. The factory manifolds and the brand name ones are all made with the same steel and roughly the same design principles. The APNs are made out of 321 stainless. The same steel that is used on aircraft exhaust manifolds, furnace parts, heat exchangers etc.
This grade is stabilized with titanium thereby making it highly resistant to intergranular corrosion (weld decay). Want to know why the Brand Name Manifolds will not use this stuff? Cause you cant polish 321 stainless and it is all about looks and advertising with them. Your exhaust gases will not and I repeat will not phase this kind of steel. Think about it for a moment........they use this stuff on Jets and Furnaces...etc.
The rate of expansion and contraction on the 4.0s combined with 409 stainless (on the factory and even brand name manifolds) and the exhaust gases breaks down the molecular composition of the steel thereby causing this intergranular corrosion(again...weld decay). Want to know why all your manifolds are cracking at the welds? Well then......there is your answer.
Save your money and buy one of these and if you want, pick up some exhaust wrap from Summit or something and that will forever be the end of your manifold problems. I personally would run these without any coating of any type as this grade of steel is resistant to rapid temperature changes. If you really need a coating on them just hit the mud a little harder
There you go.......blow that out your pipe
Ohhh Yea.....One more thing....409 stainless is really a garbage grade of steel. Spend enough years working with 321,409,301, etc in corrosive enviroments putting this and many other kinds of steel through hell and you shall arive in the same boat (maybe different name...lol)
