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Bolting on a performance exhaust system adds an exciting new tone to your car. But, that sweet song becomes annoying noise as corrosion eats away at your exhaust. If you want the music to last, start with steel that’s designed to outlive your car. Water is the natural enemy of an unprotected exhaust system. During proper combustion, water droplets form and drip from the tailpipe. Most of the water is forced out by the exhaust but a fraction of it stays behind—and, moisture and metal don’t mix. This excess water gradually turns your shiny exhaust into ugly-rust from the inside out.
Stainless steel exhaust components stop your pipes from corroding. But, not all steel is created equal. You see, some alloys corrode over time despite the name “stainless”. It doesn’t necessarily mean “stain proof”. Corrosion resistance depends on the content of chromium and nickel found in the alloy.
The most frequently used stainless steel in performance exhaust system is T409. Found in Gibson exhaust and many stainless mufflers, this mixture has enough chromium and nickel to resist corrosion. But, it lacks the strength to be used for fasteners. Next up in the ring for corrosion resistance and all-around toughness is the T304 steel used in Borla exhaust headers and Corsa exhaust. This is the highest quality stainless steel used in the automotive world. It is most often found in exhaust tips. Super tough and nearly impervious to rusting, T304 has around 20% chromium and 10% nickel content in the alloy. In fact, the ferrous metal content is so low that magnets won’t stick to it, making identifying T409 from T304 very easy.
In short, when comparing T304 vs. T409, the best choice is T304. But, both alloys far surpass aluminized steel used in factory exhaust systems. There really is no wrong way to go as both a T409 and a T304 exhaust system greatly improves your vehicle’s performance. If deciding between the two choices is corroding your confidence, check out our exhaust system reviews, and see what these kits are really made of. Or, feel free to leave a comment below.
Flowmaster Exhaust Systems
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Magnaflow Exhaust Systems
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JBA Cat4ward Headers
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MBRP Exhaust Systems
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Sale Price |
From $229.99 |
From $310.15 |
From $142.88 |
From $199.99 |
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Shipping |
Free Shipping |
Free Shipping |
Free Shipping |
Free Shipping |
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Current Offers |
REBATE |
SAME DAY SHIPPING |
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Customer Rating Price/Value Ease of Installation Quality Appearance |
(790) 
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(841)
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(222)
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(178)
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Design |
Axle-Back Cat-Back Header-Back Turbo-Back |
Axle-Back Cat-Back Downpipe-Back DPF-Back Turbo-Back |
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Cat-Back Downpipe-Back DPF-Back Turbo-Back |
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Finish |
Unfinished |
Unfinished |
Ceramic-Coated Chrome Unfinished |
Black Unfinished |
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Material |
Aluminized Steel Stainless Steel |
Stainless Steel |
Mild/Carbon Steel Stainless Steel |
304 Stainless Steel 409 Stainless Steel Aluminized Steel |
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Material Detail |
409 Stainless Steel |
409 Stainless Steel |
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Style |
Dual Exit Single Exit |
Dual Exit Single Exit |
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Dual Exit Single Exit |
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Warranty |
3-year warranty (aluminized steel) Lifetime Warranty (stainless steel) |
Lifetime Warranty |
Lifetime Warranty |
3-year warranty (black) Lifetime Warranty Lifetime Warranty (polished) |
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Reviewed by Dennis M (Mattawan, MI Reviewed for a 2006 Buick LaCrosse—2008-11-11 18:20:05
easy to install,after old muffler was removed ,good directions,good sound,a touch quiet for my taste,was wondering why?they Don't offer true duals when when it Has dual cat's on the truck.over all happy with the outcome
Reviewed by John T (Lockport, IL Reviewed for a 1994 Acura Legend—2007-08-16 06:51:19
I had the exhaust for a week now, installation was very quick at a local muffler shop. Exhaust sounds great in town, nice low tone and not too loud, but not quiet, you know you have an exhaust. My only issue is when the MDS system kicks in at highway speeds, the change in exhaust tone is annoying. This is mentioned during the order process, if you have this type of engine, you will notice the MDS system kicking in with this exhaust, with the factory exhaust, the 8 to 4 cylinder change was invisible. During city driving exhaust is great but on the highway, not so much.
Asked by Anonymous A.
7/17/2012 8:36:47 PM
IS THERE AN EXHAUST FOR AN AWD MODEL/
Answered by Nathan S. — 7/18/2012 1:58:42 PM
We are still waiting for a manufacturer to offer a performance exhaust kit for the AWD MKZ. There is a difference in fitment between the 2WD and AWD models. A lack of fitment options could be due to the center differential and driveshaft being in the way.
Asked by Anonymous A.
7/23/2012 3:16:52 PM
I have a 2012 mustang gt stock. Please provide me full details about borla touring cutback 140371 and what's included In box. Will it fit my model properly? I need more details of the kit and about what is included in box.
Answered by Elizabeth C. — 7/23/2012 3:46:52 PM
Hello Marshall. In regards to your 2012 Ford Mustang GT 5.0L, the Borla Touring Catback Exhaust System includes: 2x Borla Touring mufflers (with exhaust tips), 2x Mid-Pipe (from the X-Pipe to each muffler), 1x X-Pipe, and all hardware, brackets, hangers and clamps. The Borla p/n: 140371 is the correct catback exhaust system for a 2012 Ford Mustang GT 5.0L
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