Renix headers are very expensive. And yes, you could do both at the same time. Consider this. I'm using stock manifold with modified downpipe and stock sized exhaust pipe on my 4.6 stroker in my Comanche.

 

Hmm ok well then free flow is not as I would expect to be needed but the down pipe you make was stock size as well? Just no kink?

 

Correct.

 

So what would you recommend for some one with a renix who needs to replace their exhaust mani? I kinda had my mind set on the APN because of price and durability (from what I've read) but never thought to ask what others would suggest. For reference I have a 90' 4.0 auto.

 

I use the HO one like the APN. There is no provision for the eGR so a bung has to be put into it. A new headpipe has to be made anyway for it to work. and The O2 sensor bung has to be put into the headpipe.

 

The ho header works with the Renix head ? I though there where Clarence issues or something?

 

Bolts right up. You have to file a bit on your intake manifold. I took a photo when I did my 3rd one, knowing someone would ask.

And who the hell is Clarence?

 

Great photo I am going to have to pull one now... And Clarence is what my iPhone thought was a great idea to throw into the loop instead of clearance lol

 

Dumba$$ smart phones............

 

Yup the phone thought it was smarter then me

 

Clarenc, get me back from Hoppersville!

 

Imao