I would like to know if they help out performance wise or if they just cause a bunch of unnecessary noise. Thanks.

 

Basic research shows that bolts on in general on a D series do nothing.

Assuming you have a D series as you have provided us with zero information regarding your set-up.

 

+45 WHP

 

sorry for the lack of information, but you are correct. I am running a
d16y8 with dc headers and a magnaflow exhaust system.

 

A header is a supporting mod. By itself, even with a tune, you might see a 5-7 bhp gain, maybe. It also looks a hell of a lot better under the hood. The benefit to the specific DC header is the CARB stamp. If you don't need a CARB stamp, a header is a header.

 

^I agree, however you must also consider build/material quality when making a purchase.

 

+1... and fitment.

But in essance. A pipe.......... is a pipe.

 

For a D-series? Not so much.

 

Thanks for the info

 

dont get the DC ceramic 2piece header the welds tend to crack or rust away..
2 sets 2 different motors d15/b18 i here nothing bad about DC 1piece..
just my experience.