Help me build my headers

[VinhZXT]

Hi All,

I just got the sidepipes for my Cobra Coupe Kit car and I now want to build my own headers insteading of using the stock modified C5 headers. My car will probably be mostly a street car and will see the track sometimes. I did some searches and found out that I should be using 1 and 5/8" primaries.

 

My set up will be 4 into 2 NOT 1 because the Coupe's side pipes have dual 2" side pipes. The plan for my new headers will be coming straight out from the heads thru the fender well and then running behind the front wheels to the side pipes. My question is how long are my primaries between the heads and the Y's. Is it correct that the longer the better? sort like long tube headers?

 

Another question is where the heck can I put the O2 sensor bungs? I might have to put in a 2" X so that I can put the O2 sensor bungs in. Or I can go from 4 into 1 and then back to 2 to go into the sidepipes. Wow what a mess. I need some ideas and suggestions guys.

Thanks in advance for the inputs

Vinh

 

Edit: I have an LS1 into a 280Z BTW.

[randy 77zt]

sanderson makes some tight space kit car headers for many different engines.for your 4x2 headers i think i remember seeing header kits somewhere with precut flanges and a box of bends.the 02 sensors can be put in 1 of the 2x1 collectors on each side.you might want to take the firing order into consideration-to get a more even sound.there are companies that cater to the street rod crowd that can reburn the ecm to ignore the lack of vats,egr,cat monitor 02s,fuel tank pressure sensors so you dont have constant trouble codes.or you might by some ready made tight space headers and branch back out to 2 pipes.

[VinhZXT]

Randy,

Thanks for the reply. I've been searching and calling some headers companies to get their recommendations. Unfortunately there is none close to where I live. Otherwise I would just bring the car to them and let them do it. I know it will require a lot of work to build these headers so I will take my time to research. I do have to finish up the exhaust system completely so that I can move on to the next stage of my project. That is to strip down the car and put it on the rotisserie. Oh boy I can't wait.