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Originally posted by talon749 if you want nice grunt in the lower rpm's go with a 4-2-1, if you want to make a few more ponies up top, 4-1 honestly I don't think you will notice much of a difference either way, both open up the exhaust flow nicely, the runners should be equal length on a good design, nobody makes a long tube header for the eclipse 420a, if they did it would be the best.
Pretty much covered the info here.
I have no problem with the E-bay headers. Just a couple of things. You might want to grind out the inside weld spots on the runners (I had to on a couple of mine. AND you wil probably get 4-1 headers, even if they say 4-2-1 headers. Gotta look close at the pics (and they are not necesarily corect with what they are sending. I sent back a couple when I wanted 4-2-1's and I finally gave up and just 4-1.
Captain Caveman
96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq 97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq 98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats 99 OZ 5sp Stocker 15.856 @ 85.97 99 GS stocker auto 17.7@77mph!
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