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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 07-29-2009, 01:03 AM   #11
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Only if it'* coated.
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Old 07-29-2009, 05:32 AM   #12
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Exactly. I agree with Dan stainless is your best bet. Steer clear of the painted ones to, there have been reports of having a lot of smoke while the the engine heat burns the paint off.
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Old 07-29-2009, 08:05 AM   #13
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Those pictures look to me like the first generation. Not the second design. The second design has the tubes angled more toward the exit of the log than the first design.

The mild steel has been known to crack as it appears the welding has issues. The stainless has been noted as the way to go because it does not crack. Recently I have become aware that a few stainless ones have cracked.

Install is easy, as long as you are willing to take the chance that they will crack and need to be rewelded, it'* a great mod. Like Dan said, best flow for the buck w/o going to headers.

Please remember that it is recommended to skew the front cylinder bank fueling by 2%
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Old 07-29-2009, 10:19 AM   #14
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What chu mean by skew front cylinder bank fuel Bill? Im genuinely curious, never heard of that.
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Old 07-30-2009, 01:22 AM   #15
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as far as exhaust temps, people believe that the cooler the the better, not in the case of exhaust. exhaust gasses love to flow fast, and the faster they flow, the better the car breaths. the best intake system starts with a good exhaust. if the gasses flow faster they will move out of the cylinder faster and draw in a better quality of air into the cylinder.
now, the way to keep exhaust gasses flowing faster is to keep them hot. ny going with ceramic coated headers you are allowing that pipe to hold heat therefor not allowing the gasses to slow down. people that hallow out their cats, all they are doing is making a place for those gasses to expand and cool down, so what they are doing is allowing those gasses to get stuck in a sense.

Me, what i like to do is get a good set of ceramic headers and still put header wrap on it to make that manifold hot as heck. gotta makesure the material of the manifold can take it though without major warpage or cracking.

i do it for performance and on certain years, for the 02 sensor.
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Old 07-30-2009, 08:10 AM   #16
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Most folks on the forums and ZZP'* website say that adding 2% more fuel to the front for the increase in flow is a good average to start with. Due to the increase in flow, you could run the front cylinders lean and heat them up. Adding that bit of fuel brings them back in line.
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Old 07-30-2009, 12:33 PM   #17
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how do you fix running lean billboost?
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Old 07-30-2009, 02:00 PM   #18
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You determine why the car is lean. I ask a few questions like:

Is the fuel pump not keeping up?
Is the pressure regulator not doing it'* job?
Is the car a 2000+ (those are always lean)
Does the car have a custom tune?
Are there mods on the car that would cause it to run lean?
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Old 07-31-2009, 11:03 AM   #19
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And i would answer back like this:

I believe the the pump and pressure regulator are fine?
The car is a 2002.
The tune is a zzp 1.0 off the shelf tune.
Downpipe and high flow cat??
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Old 07-31-2009, 05:11 PM   #20
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How do you add 2% in the front? a tune?
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