, lol 
What size headers to get?
Thread Starter
Joined: Dec 2004
Posts: 1,294
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From: Dallas (Richardson), TX, USA
What size headers to get? I'm looking to build a 454 LSX next year. Nothing fansy, just lots of power and torque for the street. I'm hoping for 600RWHP through a T56. What size headers should I use? 1 7/8"? 1 7/8" stepped to 2"? I even see that Kooks sells 2" headers now?! Would that be too big?
We're will be running ARH 2" headers to 3.5" Y-pipe on our LME LSX 454 that will be topped off with a 300 shot... We talked it over with our tuner, Nick, who then talked with the owner of ARH, also Nick, and both Nicks recommended the 2". YMMV
Last edited by Azrael; Jun 26, 2008 at 09:52 AM.
Thread Starter
Joined: Dec 2004
Posts: 1,294
Likes: 0
From: Dallas (Richardson), TX, USA
Does spray have any impact on the size of headers you should use? I wouldn't think so since it doesn't increase air flow but just the amount of oxygen in that air.
Also, how is fitment on those 2" headers? I still have a stock K-member but will upgrade if necessary.
Also, how is fitment on those 2" headers? I still have a stock K-member but will upgrade if necessary.
We will be running the exhaust with cathedral port heads (TFS 245mm milled to 68cc's), and I am sorry but it isn't in quite yet. Still have to get a few small things for it.
I am interested though in how others decided to go with their exhaust on the larger strokers. Jeff aka AMERICAN_HP is running 2" primary headers on his LME LSX 454 in his Corvette and has had good results. I hope others will chime in and we can possibly get some theory or actual tech from the exhaust experts (which I am not). That is why I put the caveat that YMMV...
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That is why we went specifically with the UMI unit! All of the other k-members have one cross bar underneath whereas the UMI has 2 welded together. Sam Strano has stated on here that he did research on the aftermarket k-members and the UMI is the only one he would sell. I must say it is a very solid piece, and the other manufacturers make great products, but we felt the UMI would be the strongest. Also UMI offers the upgrade to a "road race" k-member with even more bracing, although we decided on the regular/standard tubular k-member for a little extra weight savings.
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n2o does not increase intake air volume but it does greatly increase exhaust volume. so yes. it does help to have a larger exhaust for an n2o car. for na cars, smaller headers would be better suited imo
