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Does this warrant getting a replacement car with no metal oxidization or it's not a big issue ?
This has been discussed and covered before.

Your exhaust system is NOT a cosmetic feature, it is a functional feature of your power train. Unless you have a rust through resulting in exhaust leaks.. this is a non-issue. That rust actually seals the steel from further corrosion (it is a stainles alloy, and many such alloys actually do develop surface oxidation).

This is completely normal oxidation. Two effects at play here... one is when the pipes are formed and welded at the factory... the welding results in oxidation at the weld points, and can also oxidize adjacent surfaces as well. 2) hot exhaust pipes, condense moisture from the air as they cool down.. as do your brake rotors (go ahead check your brake rotors after they sit overnight on a moist night.. you will see surface rust on the rotor (also normal). You can go over to your dealership and climb under and inspect other Hondas, not just CRVs, and you will see the same thing.. and it is harmless.

Now.. a few owners can't seem to stop looking under their vehicle and obsessing over their exhaust pipes having production oxidation on them and have chosen to actually paint their exhaust pipes with a flat black or gray high temperature paint. I do not recommend this, but hey.. each owner if free to do to their CRV as they wish. :)

By the way.. for many metal alloys used in modern vehicles.... oxidation is normal and actually seals and protects the alloys from further oxidation or other degradation... even due to seasonal use of road salts.
 
Stainless Steel muffler for Honda? as you may not be aware the system cost about 900.00 to change out.

What are the symptoms of a bad Exhaust Pipe?
When a portion of the exhaust pipe fails you may notice a check engine light, depending on which section has become perforated, but you will certainly notice the engine has become substantially louder and may lack power or use excessive amounts of fuel. That is because the engine may be compensating for the false readings from the oxygen sensors. Visible clues include rust or damage to the exhaust pipe, signifying an area that may be leaking exhaust and preventing the processing of exhaust gases.

How often do Exhaust Pipes need replacement?
Exhaust systems incur enough failures that specialized shops for exhaust systems have sprung up in most towns around the country. However, the typical repair is more likely to be a muffler, catalytic converter, oxygen sensor, or exhaust manifold gasket. Exhaust pipes are made corrosion resistant, and it takes many years for that material to break down under dry conditions. This is why most vehicles in dry climates will never need a section of the exhaust pipe replaced. Those who live in areas frequented by snow, road salts, heavy rains, and high humidity are at higher risk of needing the exhaust pipe replaced, and this can become a necessity in only a few years in the northeast united states.

this is where you see the problem, you seee the welding points
How are Exhaust Pipes replaced?
Since exhaust pipes are either clamped together or welded on, the replacement procedure may be to cut off the portion of the pipe needed replacement, or disconnect the portion of pipe at the clamping location. Once the bad section of exhaust pipe is removed, the new section can be cut to size, fitted, and clamped or welded in place. If the portion of the exhaust has been ordered from the manufacturer, only removing and replacing the fasteners is typical, but if the pipe is being repaired from raw pipe, the technician will likely need to bend the pipe to match the old section before refitting and welding or fastening the pipe in place.

If you like, and anyone with a 5th gen can take a snap shot of the earliest 5th gen, ask and we'll show you how well it held up?
 
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well it's supposed be a new car (9km) so why wouldn't i get one with shiny pipes instead the one with rusty looking ones...
Like I said, it may be new to you, but unless you know the actual build date, it could have been sat outdoors for days/weeks/months - its not uncommon.

And if you did ask for a new replacement and I was the sales guy or manager, I would seriously have a tough time trying not to laugh before sending you on your merry way!
 
Surface rust is inevitable. Those parts are not designed to be free of rust; the same is true of many of the steel parts on the underside of the car. Relax.

If you think you see some rust now, just wait until after the first winter, assuming you live in an area with road salt!
 
The surface rust didn't really bother me but living in an area where corrosion from salt is common, I did what Williamsji mentioned earlier. I sprayed the exhaust in12/2019 with high heat paint and left the rest up to mother nature. No corrosion since then!
 
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