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Old 02-21-2008, 11:23 PM   #1
leafs fan
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Default Can someone help me please???

I just received my borla headers and I am thinking of getting them coated inside and out but this is something I have never done before. So can someone explain to me what do I need to know before getting this done. The main questions I have is

Is it really worth doing for SS headers?
Does it give the headers added protection against corrosion?
Is coating them better when your are installing a HFC?
Inside and outside?

I am a complete newbie on this subject tell me everything you know about coating headers.
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Old 02-22-2008, 04:26 AM   #2
PA-Outback2000
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don't know too much about coating, but outside seems more popular. if u do to much you may warp the heasder or something. i have read other posts and there really hasn't been corrosion problems. unless u ae running in the rain all the time, there shouldn't be a prob. that's why they are stainless steel. i may be off base here but that is what i have heard.
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Old 02-22-2008, 07:48 AM   #3
leafs fan
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From what I understand there is a different kind of coating on the inside then on the outside. Also if you coat the outside you should coat the inside.

I am just not sure if I should invest money into doing this. Dont know the pros and cons. cmon people I need suggestions as I want to get this done soon. You know if this was a thread on what intake to get on my 2.5i it would be 2 pages long by now.
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Old 02-22-2008, 09:06 AM   #4
mopartodd
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I don't think the ceramic coating will discolor like some pipes do. The coating is said to help scavenging of the header as well. Not sure how much it would aid performance though.
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Old 02-22-2008, 10:59 AM   #5
rubyred88
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I would coat only the outside if you really felt the need. Take a look at this article and see if this helps you. http://www.carcraft.com/techarticles...ngs/index.html
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Old 02-22-2008, 11:40 AM   #6
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Ceramic coating is like wrapping your headers. The point of it is to keep the exhaust gases flowing hotter and it will go through faster. This can also help for those winters by keeping the exhaust warmer so you don't get thrown a code like P0420 and ceramic coating will also help resist corrosion.
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Old 02-22-2008, 04:07 PM   #7
leafs fan
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Quote:
Originally Posted by rubyred88 View Post
I would coat only the outside if you really felt the need. Take a look at this article and see if this helps you. http://www.carcraft.com/techarticles...ngs/index.html
Wow, good read. Thanks for the replies everyone.
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Old 02-22-2008, 04:47 PM   #8
rougeben83
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Is it really worth doing for SS headers? Depends if you want to spend the extra $200
Does it give the headers added protection against corrosion? Yes, only if it's done right
Is coating them better when your are installing a HFC? Coating will help keep the gas temps up, heating up the cat faster, you're less likely to throw a code with the coating.
Inside and outside? Again, depends on the shop. Mine were coated inside and out because that's the normal procedure. If they ask for more money to coat on the inside, it's up to you if it's worth that extra cash.

Most ceramic coatings aren't fully cured until you've run them on the car for a few minutes. Extra caution must be taken during the install so you won't chip or scratch the coating until it has hardened. I've had mine for about 1.5 years now and it still looks like new despite midwest winters and road salt.
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Old 02-22-2008, 07:29 PM   #9
leafs fan
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Just a question about stainless steel. The headers I received are Borlas, who makes their exhaust products of SS. Looking at my headers that I received they look more dull then the usual SS that I have seen on catbacks and exhaust tips. Is that normal? Is SS sometimes not so shiny with a mirror finish?
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Old 02-22-2008, 07:50 PM   #10
RaceFaceXC
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Stainless steel is just a steel that uses a few % of nickel and less iron than a mild steel or high tensile steel. The nickel used in the SS alloy is what makes it "stainless" and a quality, well made SS will withstand many years of anything you can throw at it without having problems or corroding. Some alloys (the lighter weight ones) tend to discolor to a brown after a short time but that does nothing to affect performance. Your question about the SS being shiny or not is just a matter of how the manufacturer finished it. Those shiny mirrored catbacks are polished SS. The dull more grey colored piping is the same steel, just not polished. You can polish it yourself but it will take A LOT of time and work to do by hand. And the right equipment/compounds. Some SS is "brushed" and it looks like a slightly shiny finish with aligned grain marks (my favorite). This is accomplished by using a brush made also of stainless steel (usually a highspeed wire wheel) to scuff the dull surface. this will also discolor over time. The polished SS will stay new looking the longest due to the reduced surface area (no pits or grooves on the surface) for the elements to oxidize. Coating the headers is done to keep the exhaust gas temp's higher further down the system to maintain velocity longer, as EdHilario stated. Keep in mind that inexpensive headers that are SS may be a low quailty SS with other alloying elements used to cut cost on the raw metal. these alloying elements can cause undesirable traits such as brittleness, areas where corrosion can bite in (often on and around the welds), inconsistent thermal properties (expansion rates, melting points, reactivity @ high temps to name a few). If you have genuine borlas you should have some pretty descent quality steel. They used to have problems with cracking near the cylinder head flanges but i have heard many times that they fixed this problem.
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Old 02-23-2008, 01:32 AM   #11
leafs fan
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Thanks RaceFaceXC for the reply. I do have the genuine borlas. I think I am going to pass on getting them coated. I just think it might be, not waisting money but not really a neccessity. I dont want to spend anymore money then I have to having just bought a cat and headers.
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Old 02-23-2008, 02:10 AM   #12
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you could do a little experiment for only a couple bucks and see how much improvment you feel... drive with them naked for a few weeks (give your ECU time to adj for the new headers flow and such) and then wrap them right up to the cat. see if it creates (or eliminates) and CEL's, makes any noticeable difference in performance, sound, miliage, etc... if you log, post some logs that might be helpful in seeing any changes, like O2 sensor voltage, and O2 sensor related parameters. i might do that when i finally get my ****ing exhaust in the mail.. it's been forever since i ordered!!!
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Old 02-23-2008, 07:30 AM   #13
EdHilario
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Just wrap them instead of coating.
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Old 02-23-2008, 07:37 AM   #14
leafs fan
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I would think wrapping them might cause them to corrode faster, wouldnt it? When the wrapping gets wet (on a rainy day or in winter).

It would be pretty cool to do an experiment like that however to much down time. Getting them installed then taking them off and the day or two it takes to get them coated (I think its about that long) then reinstalling them. I'm to lazy.
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Old 02-23-2008, 12:17 PM   #15
RaceFaceXC
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wrapping them will hold water and everything else against the header, that is correct, but again you should be ok with the Borla SS. corrosion should be the least of your worries. maybe ask Borla what they think about wrapping them.
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Old 02-23-2008, 07:22 PM   #16
leafs fan
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Its okay, I am going to leave them the way they are. I was just a little concerned as I am use to seeing SS as a nice shiny reflective peice. I took them out of the package and it wasnt very shiny at all. Kind of a newbie response I guess. Thanks for all your help guys. I have learned a lot from this thread.
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Old 02-23-2008, 07:43 PM   #17
EdHilario
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I was gonna do it just in case I get a CEL during cold weather or it may give the O2 sensors weird readings.
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