I have an 03 Cav (5Spd) In the spring I plan on getting a 4-2-1 header, going into either 2.5 or 2.25 pipe, no cat, and then into a 2.5 inlet Dynomax race magnum muffler(already have this from another car). My questions are who else besides RK Sport makes a 4-2-1 header? Is there really any differance between them or should I just get the least expensive one? I don't plan on any other major mods such as turbo/supercharger/nitrous, is the 2.5 inch pipe over kill? The only other mod I see myself doing is an intake. And finally what kind of a HP increase could I be looking at with a set up like this 10 HP max? Thanks!
2.5 would be overkill... AND it would sound terrible.
I have the RK header (and we sell it) and I love it. I have not seen another 4-2-1 for the Ecos, but that doesn't mean there isn't one. The thing you have to remember is that you get what you pay for. I've seen a lot of 'off brand' headers with a ton of slag in them = less flow. The inside of my RK header was smooth as silk. Just something to think about.
And yeah, I'm not sure you will even see a 10HP gain from exhaust and an intake. The companies like to make it sound like you will, but in real life, I kinda doubt it...
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actually Weapon R makes a 4:2:1 header for the eco
which is the same as RK's basicly but it just fits better
because people have had problems with the fitment on RK's Eco Header.
I didn't have a problem, I don't think 03 CavFire did
but you might want to consider the New 4:1 Header from Pacesetter.
theres a post in this forum about it.
Its just not as pretty as RK's
and you <b>should</b> get an intake with all those mods!
AEM makes an intake for our cars check them out
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<img src="http://www.j-body.org/registry/pokitrokit2000/elguapo3.jpg">
yeah id go with 2.25" pipe , and keep your cat !!! its a hefty fine if you getcaught
and teh caton the eco's been tested against other high flow cats , and it made more power than the aftermarket 1's
and actually youll loose power with it gone , if yur going to run nitrous , id get a cut out before the cat , to help protect it
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I have weapon r 421 header ,high flow cat ,mandrel bent 2.5" cat back with res muffler. It sounds good and does not have alot of crackel. I desided on 2.5 because I needed the increase flow rate because I have a 100 shot wet kit of nos and my friend has same set up but with 2.25 piping and a can beat him every time racing even better a role. If you where going with nos,turbo, or supercharger I would go 2.5.
