Hey, I'm just wondering about headers for my 4.2, I'm looking to do my exhaust with a flowmaster super 40, and I want to do headers as well but I dont know whats out there?

 

jba has a set and i belive mac sells a set that fits 3.8 stangs and 4.2 trucks. i have the jba's they installed good bolted right to factory y pipe and have all o2 sensor bungs. i got the nickel plated ones and they still look good after 20k miles. as for sound and performance i didnt feel all that much difference and i even had the upper and lower intakes ported and polished,

 

so were they worth it? do you notice any improvements at all?

 

I dont feel they are woth the $400+ that they cost and even more if you get the ceramic coated ones. they do look better then the stock manifolds though and it does sound alittle throatier afterwards. i've never had it dynoed so i cant say if they actually give the 18hp they say they do. i did put them on a 120k truck so the benifits might be wasted on my worn engine. if your planning on supercharger or turbo in the future they would benifit from headers.

 

yeah i was thinking on waiting until my engine was more heavily modified

 

Dont add headers until you have internal engine mods, it wont be worth it. I didnt add them until I had all the bolt ons and cam, etc...