Hi, anyone have any experience with or know if this exhaust is any good? I'm on a limited budget but want a agressive axle back setup. They are sold on eBay. Here is a link. Any info would be greatly appreciated.
http://pages.ebay.com/link/?nav=item...d=171767415398

 

Sounds real good. Comes in 3 pieces on each side I think so you can adjust everything to be straight. Drones a bit... Clamps are worthless need to buy new ones.

 

If you buy it, it would be appreciated if you would post how much drone the system has at different speeds. Some on the forum have paid a premium to avoid drone.

 

Awesome thanks! I think I will give it a try. Just spent a ton of money on my car and just can't afford the name brand $800 plus systems. I just put 1 7/8" American racing long tubes and matching 3" catless X-pipe to complement my already installed AA supercharger. It's just too quiet for me with the stock Ti axle back. I will defiantly post up the install and drone results in about a week. Gonna order today.

 

I was looking into these not long ago, apparently they are the exact same as the OBX catback system, just rebranded and painted black.

You will find a lot more feedback on the OBX system.

Same company, just rebranded with a new name, that's all.

 

Cool, didn't know that, thanks! I'll look those up.

 

I have not dealt with this exhaust but just as a general rule, black radiates heat much more than a polished or bare metal. This is why you never see an oem or reputable aftermarket company making any exhaust component black. This certainly has the potential to cause heat issues, but since it is way at the back you may never notice.

 

Actually, the OEM exhaust, with the exception of the portion of the catback that goes over the axles, was painted black from the factory. The '01 and up did have chrome exhaust tips added to enhance the appearance.

 

Can you please explain the physics behind this as I'm hesitant to call BS? Black generally absorbs most of the sunlight spectrum and thus becomes hotter in sunlight, but regarding physical heat transfer the color of the paint should make absolutely no different unless the paint itself traps heat (which would be completely independent of color).

 

If you are on a budget get the Z06 catback. It is good piece and not to expensive second hand. If you want a maximized catback and you have headers you will need a true 3", of which I think only two companies make.

 

 

Had a stainless obx that looked like this one on for a short time. Did not like the look of the back though. you could see the mufflers hanging down. Just not a nice clean finished look. I also have a set of bullets two much drone at cruising speed. You might want to try a middamerica catback very reasonable price and quality seems good. I now have a middamerica quad qruisser now its a little louder than stock and looks great.

 

Why not just do the bypass mod to your Ti exhaust?
It'll cost you less and the quality of the Ti is going to be much better than cheap import stuff. And certainly lighter, too.
I also wonder why that system is painted, considering the "SUS304 high grade fully stainless steel." I don't recall ever seeing an aftermarket SS exhaust system that was painted.
But then again, I was born yesterday.

 

I guess I could be wrong about the stock exhaust. When I pulled mine it just looked like weathered stainless, but it could have been coated with something. I would be surprised if it was just paint, i would think it would be some sort of heat coating.

It is my understanding that heat transfer works in two forms, convection and radiation. Convection (http://en.wikipedia.org/wiki/Convective_heat_transfer) is a transfer of heat energy through mass movement. In the case of a car, the radiator primarily works through convection (funny they are called radiators) by moving air through the fins. The heat from the coolant is transferred to the mass of the air as it moves by.
Radiation (http://en.wikipedia.org/wiki/Thermal_radiation) on the other hand works completely separate from convection by converting thermal energy into electromagnetic energy, this is then emitted by a surface and absorbed by another surface and turned back into thermal energy. This is like putting your hand close to a fire or radiant heater. You feel the heat through radiation, not convection.
The amount of heat energy converted to electromagnetic energy for a given surface is described by the emissivity coefficient which varies based on the material property and the surface of the material.
http://www.engineeringtoolbox.com/em...nts-d_447.html
This table shows various values for various materials. Notice the value for polished stainless is 0.075 and the coefficient for black epoxy paint is 0.89. The black paint will radiate energy at a much higher rate than the polished stainless. It is interesting that weathered stainless also has a high coefficient (0.85), so it could be all the same or that coefficient may vary based on temperature. But you will also notice that components around the exhaust system (like AC lines) are covered with a reflective metal which is used to reflect radiant heat.
All to say, in general, if you are worried about heat, using polished exhaust components will help.

 

 

[QUOTE=MORLOK;1589508307]I guess I could be wrong about the stock exhaust. When I pulled mine it just looked like weathered stainless, but it could have been coated with something. I would be surprised if it was just paint, i would think it would be some sort of heat coating.

Stock Z06 exhaust or Base stock exhaust.... the Z06 stock exhaust is Titanium the Base stock exhaust is not...

 

[QUOTE=73Corvette;1589508390]Mine is a base model. But I was referring to the pipes from the Cats forward. Was the entire Z06 system titanium (from the manifolds to tips)? I thought it was just the cat back part.... i guess I never realized that.. interesting..

 

I see what you mean. I believe the higher coefficient comes from the fact that it's a paint, not necessarily the fact that it's black or epoxy. I notice "paint" (non-color specific) has an even higher value than the black epoxy paint.

I found this while googling for information:

http://www.molalla.net/members/leeper/coatbar.htm

It's a simple study someone did on the internal temperatures of two identical LED flashlight when one was left polished/bare while the other was coated in black paint. The black painted one consistently had lower internal temperatures indicating that it radiated/dissipated heat at much higher rate than the polished/bare one. However the author notes that the emissivity between black paint and white paint is within 1% and in all reality makes little difference. He claims it essentially boils down to the fact that most paints have high emissivity ratings and will radiate/dissipate heat faster regardless of color. It's the polished/bare surface that stores heat for longer.

But your core point is still correct (and I stand corrected) -- if you paint the exhaust the exhaust itself will radiate more heat. In the end this ends up releasing more heat under the car and to surrounding components rather than out the back of the exhaust and away from the car which is a bad thing.

Science is cool

 

I appreciate everyone's input on the subject. I actually ended up trading my stock Ti exhaust to insertclevername for his bola stingers. Great member to do business with!

 

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