I drive a 91 z28 and i am looking to pull the most HP possible out of some headers whats are the highest flowing headers around... and how much is the most HP you can pull out of headers.. i got a grand to spend help me out. thanks

 

depending on your mods you have now, your not going to see much of a difference in any set of long tube headers. In a heavily modded car the gains will be more significant that a lightly modded one.

 

Long tube headers mated to a true dual exhaust should net you the greatest gains.

 

understood.. but what is the best headers then or whats the top few im not looking to pass emissions or nothing.. im going to hook these up to catless true duals so im looking for the best headers i can please help

 

from experience, jet hot coated hooker headers will do the job pretty well.

 

i keep hearing that pacesetters are where its at how true is this

 

Don't know what's considered the best, but the Pacesetters are decent and are fairly priced.

 

It totally depends on your mods. If you are lightly modded you probably will be better off getting some mid length headers instead of long tubes.

If that's the case, and you are lightly modded, I would reccomend Arizona Speed and Marine headers. They are superior for quality and power. If they are too pricey, then RK sports headers are of a very similar design, but cost a lot less. One thing that is bad on both of them though, is plug access. I had the RK-sports on my Z back when I was running bolt ons, and I dreaded the day I had to change the plugs.

Now, if on the other hand you have a highly modded car (383, big cam, $$$ fully ported aftermarket heads, blower, N20, Turbo ect.) Then I believe that Kooks are the best for power. I upped mine to Hooker LT's when I put my 383 in. But if the Kooks were out at that time, I would have gone with them. If it weren't such a pain, and the cost difference, I would probably even take my Hookers out, and swap them for Kooks.

 

if kooks are the best on a highly modded car woulnt it be good on a slightly modded car...

 

not necessarily. the scavenging effect plays a significant role. if you are planning major mods later on then you might as well go big the first time.

 

Kooks are arguably the best long tube on the market in terms of quality and performance. Pretty much all the long tubes will be pretty close though in terms of gains. The Pacesetters are a good budget long tube. They will net you good gains, have good clearance, and are "decent" quality.

 

so kooks are the way to go if your planning bigger mods down the road and not to worried about a budget and pacesetters are cost effective... understood.. thanks alot guys once again.

 

a couple more things... i drive a 91 z28 5.7 350TPI and i cant find kooks for them am i correct in saying they dont make them for my car?? what would you say is right under kooks in performance if you were not on a budget

 

On Kook's site, they don't have headers listed for your application. However, when poking around on Hawks, it appears they offer stainless long tubes for the third gens. I don't know if they make these in house or what not. http://www.hawksthirdgenparts.com/in...OD&ProdID=1704

 

You can't just look at "brand name" or whether its the "highest flowing". You have to look at the primary diameter, whether its a "step" design, the length of the primaries, anti-reversion provisions, etc. Which header you need is a function of the engine's HP level, AND how you plan to use it. You might select one header design for max low end torque/area under the curve on a street driven car, and a completely different design for a track car that needs optimized torque and HP over a fairly narrow band at the top end.

A Kooks 1-7/8 primary will outflow about anything else you could look at, but you don't want a 1-7/8 primary on a moderate HP 350ci engine that is purely street driven. The lack of velocity/scavenging will kill low end.

Buying a header because it has the highest flow, and putting it on a lower HP/displacement setup is like buying a set of AFR 227 heads and putting them on a stocker..... they'll flow like crazy, but not at the velocity you need for good low end performance, and you're engine won't be capable of reaching the flow and RPM levels that can take advantage of the flow capabilities.