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Old 05-09-2012, 01:45 PM   #1
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Headers... chrome or coated??

That's the question. Does coated really keep underhood temps down?
Gonna do shorty/mid length. Pace Setter or BBK?
1994 Camaro Z28, K&N intake, PaceSetter, No cat, Flowmaster, MSD OptiSpark,Taylor, NGK Iridium IX Plugs, Bilstein BTS shocks and springs, BMR adjustable torque arm, lower controls arms and relocation brackets, adjustable panhard rod. Eagle 077 wheels, Cross drilled rotors, Red calipers, Clear corners.

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Old 05-09-2012, 02:25 PM   #2
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Re: Headers... chrome or coated??

I really don't notice any difference. Might help some, but you won't get any real difference.
1994 Z-28 LT1 A4, Supercharger 6 psi, 3.73 Gears, GMPP 1.6 Rockers, LT4 Springs, 42LB Bosch injectors, PCMFORLESS tune, All MSD ignition, Inline fuel pump, SLP sub frames, Panhard Bar, strut bar and rear control arms & LCA relocation, 1LE sway bar, Mid pacesetter's. 3" exhaust to Jegs electric cutout. Nitto NT555R Extreme Drag Radial 275/40R17
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Old 05-09-2012, 03:32 PM   #3
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Re: Headers... chrome or coated??

The cera-metallic coating, applied inside and outside the primaries, definitely reduces heat loss to the engine compartment. Additionally, it reduces external corrosion and cracking due to thermal cycling, and has been shown to produce couple extra HP by keeping the exhaust gas velocity high in the primaries, increasing scavenging. I wouldn't even consider buying uncoated headers for a street car.

Chrome does none of the above, and will discolor almost immediately.

I have some modified AS&M headers that are now 15 years old. I bought them used 12 years ago. They have been subjected to the abuse of a 20+# boosted LT1 and my LT1 spraying a 300-shot. They came with an HPC cera-metallic coating, and they still look decent, with only minor rust around the weld splatter.

94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 05-09-2012, 06:18 PM   #4
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Re: Headers... chrome or coated??

Chrome just won't hold up. It flakes, it rusts, it just looks like crap over time. That and as mentioned, no performance advantages to speak of.

I'm surprised companies are actually still chroming... though I realize a lot of the 'rod' crowd still use it for trailer queens.
'97 M6 Z28
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