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This video explains the difference between T 409 and T 304 stainless steel exhausts.
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So we have had a lot of questions recently about the differences between T-409 stainless steel and T-304 stainless steel and why there is a price difference and what the differences are. So we thought we put together a video and answer the question as best we can. T-304 stainless steel is a higher grade stainless steel and what makes steel stainless is the chromium content and the nickel content. T-409 has about 11% chromium content and about a half percent half of one percent nickel content.
T-304 stainless steel has about 20% chromium content and about 10% nickel content. So you have got about twice the chromium and about 20 times the nickel content in T-304 stainless steel. Some of the things that are going to differ between the systems; T-409 over time tends to show a bit of surface corrosion or surface rust. It is never going to damage the structure of the exhaust, it will always just fine, so but you do have a little bit of surface corrosion. Also the well point on the exhaust are kind of brownish and whereas the rest of the exhaust is shiny, just over color.
T-304 stainless steel you are never going to get surface rust or surface corrosion and the well points on the exhaust are also going to be the same color as the rest of the exhaust. So T-304 stainless steel is a higher quality, higher grade system. Typically you are going to get the same power gains out of the both systems; they are all made of the same gauge of metal. So it is the same thickness of metal so you don't have to worry about adding extra weight or anything like that by choosing one system over the other.
So you are going to pick up the same gains and horsepower, torque and fuel economy, but the T-304 system is going to look better over the time. So if you are just looking for the aftermarket exhaust sound or more of a muscular sound and the performance gain, T-409 is a great way to go. If it is going to be a show car, where you plan on showing it off a lot you definitely want to go with the T-304 stainless steel because it is going to look better longer.