My HP racing header I installed today look smaller if you compare the two lower halves of the headers. If you compare the top halves the hp one was WAY better/thicker. So why does the bottom half of the stock h22 header have way bigger runners than the HP.

I had a dc on my old h22 2 years ago and noticed the same thing. Do these headers make any difference or does the stock put out the best?

 

Come on guys any info?

 

No info from anyone here.

 

how's the inner tubing, same size?

 

I think the stock ones are efficient enough and they work just fine for me.