6.7L Cummins Forum

Why T-409 type Stainless Steel Exhaust?

409 type Stainless Steel is specially designed for automotive exhaust
systems.
409 type Stainless Steel resists atmospheric and automotive exhaust gas
corrosion.
409 type Stainless Steel developes a light surface discoloring which will
retard progressive corrosion.
409 type Stainless Steel contains 10.5%...11.75% Chromium

Why T-304(14G) type Stainless Steel?

304 type Stainless Steel contains 18%...20% Chromium and 8%...10.5% Nickel.
304 type Stainless Steel has excellent heat, oxidation and corrosion
resistance.
304 type Stainless Steel Looks great and will shine for ever!

How to clean Stainless Steel .

409 type Stainless Steel can be cleaned with non metallic pot scrub pads
and soap, ammonia, liquid or powder detergent.
304 type Stainless Steel can be cleaned with non metallic non abrasive
cleaning pads or brushes with soap or liquid detergent, use "Chrome polish"
if necessary.

Do not clean with Steel Wool or a Steel Brush you will scratch the surface and surface rust will result.


The most common stainless steel used by muffler shop is the T-409.

High end exhaust systems like Borla and corsa
use T-304 stainless steel grade and is why the price is so different. A
Borla looks great and will shine for ever!

T-409 is great for peoples who live where there is no calcium, salt, natural or man made like road salt and for those who garage their cars/trucks and only drive in nice weather.

T-304 is best for most of North America and Canada if you can afford it and really care if your exhaust pipe is purty.

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10