I am wanting to replace the cats with hf and also new headers on the 2011 Dak 4.7 to go with my Flowmaster 50's single. The only thing that I am discouraged about is the 08+ headers has a different bolt pattern than the 05-07 apparently from reading through other sites.


I really don't want to bite the bullet for oem cats since they're more expensive than modifying.




-Andrew

 

Why do you want to replace the manifolds? The stock manifolds flow pretty well. There will be no payback by installing headers. The restriction is in the Y pipe. The cat is pretty high flowing already as well.

You can't find any probably because there was no market for them. Just like trying to find other aftermarket performance parts for the 3rd gens.

 

My neighbor gave me suggestions, but I was a bit hesitant to fully commit and started researching before realizing that I'll be wasting all for nothing just for a bad cat. I appreciate your insight, this threw off alot of weight on my mind trying to figure this out.

What are my options to remove the restrictions in the Y pipe?

 

There are aftermarket y pipes availabe. Then you would need a shop to cut the old one out and weld in the new one.

 

If you look at pictures of the 2005-2007 heads and compare them to pictures of the 2008-2011 heads you can see different bolt hole patterns for the exhaust manifolds. Check out rockauto. They have pics of both. They also have manifolds listed under 2010 Dakota 4.7 for $140 each.