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I am going to disagree with that post because its conditional..
The LONGER primaries of the LG's & Dynatech tend to LOSE their scavageing effect above 3500 rpms..
They are GREAT for LOW END TORQUE at LOWER RPMS..
Perfect for street driving & road racers..
However for DRAG racing, the brands with shorter primaries KOOKS, AR, TPIS, will OUT PERFORM from 4000-7000 rpms, exactly where the powerband is @ WOT....
The dyno results may only offer minimal if any gains, but on the dragstrip, a .05-.1 quicker ET can be had..
Just some food for thought on this subject..
Not mentioned but I went with QTPs, the only stainless Tri-Y design. Not sure what I gave up on top (if any) but I wanted a system for the street that I felt would give the low/mid range and was willing to make a sacrifice on top if necessary. Since there is no side by side comparisons of any of these systems, its hard to make a judgement other than header design facts. Longer tubes will provide more low/mid range, shorter tubes better on top as mentioned. Properly tuned Tri-Y's have their place as well. I would look at ease of installation, all stainless, where you feel you want to make power and use these parameters to help you eliminate certain brands from the list. The hardest part of selecting components for the car is being honest with yourself on how you will use the car. I knew my car would never see the track so my cam selection/header selection, etc. reflect how I drive (didn't want a cam that made power from 4K-7K PRM as I don't drive there).