im thinking of having my plenum ceramic coated ,i got a good deal on it,what are the benefits if any.

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1987 Trans AM GTA
305 5SPD
Hypertech airfoil
gutted maf
kn filter
High Flow Cat,
3"Walker pipe
Dynomax Super turbo Muffler
TB Coolant bypass

"Three of the scariest letters you will ever see GTA"
Take a good look you won't see em for long

 

um.....it looks sweet??

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"When something breaks, it gives me an excuse to replace it with a performace part!"
1988 GTA
TES headers
Flowmaster exaust
TB airfoil
165 Tstat
JET Fanswitch
K+N's
JET chip
kenwood head unit, xplod amp, poineer 3 ways
weird rattling noises
dying 350
crappy paint
700R4 on its last leg
hood that won't open - sometimes

 

If you coat it on the INSIDE, that will probably give you a small benefit. The air would be able to "glide" better on a smooth coated surface then the porous cast aluminum surface.

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92 Z28 5.7
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Trick Flow 23° heads, Comp Cams XR270HR-10 cam, Accel intake base + ported TPI,
TES headers, Flowmaster catback, MSD ignition, #24 SVO injectors, 1LE aluminum driveshaft.

Click here to see pics of my car !

 

Plus if the inside is coated the EGR gasses (If running egr) won't as readily build up on the casting...

 

I'd get a heat-barrier coating put on first(exterior of plenum) and then a 'finish' on top of that(heat-barrier usually comes in flat-black). Wouldn't hurt to do the same to the runners and base(especially the bottom of the base).