New Flowmaster Axle-Back Released
Mach 1 Member
Joined: April 16, 2006
Posts: 912
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From: Colorado
"409 Stainless Steels contain a
certain number of surface inclusions
which are the normal result of titanium
stabilization additions to improve the
steel. Occasionally, rusting may occur
at these inclusion sites and lead to problems
with cosmetic appearance. As a
result, these steels are not suggested
for applications where surface appearance
is a factor." -aksteel.comcertain number of surface inclusions
which are the normal result of titanium
stabilization additions to improve the
steel. Occasionally, rusting may occur
at these inclusion sites and lead to problems
with cosmetic appearance. As a
result, these steels are not suggested
for applications where surface appearance
This explains the surface coating on the mufflers. Even though they are stainless, the 409 isn't "pretty" so they made them black, which is my preference.
Looks like these will be good. Guess we'll have to see who posts a vid first?
Last edited by shaun_beauchamp; Jan 4, 2009 at 11:20 AM.
Legacy TMS Member
Joined: October 2, 2006
Posts: 4,777
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From: Southeast Michigan
T409SS is also stronger than T304SS. There's more titanium content in the T409 as well as more ferrous metals, which gives it the better strength favored by the OEMs.
If these new Flowmasters are indeed made of 409SS, this is almost a FIRST for Flowmaster. Their entire exhaust lineup was predominantly aluminized steel. Perhaps customers are finally realizing that aluminized steel has no place on modern exhaust systems.
If these new Flowmasters are indeed made of 409SS, this is almost a FIRST for Flowmaster. Their entire exhaust lineup was predominantly aluminized steel. Perhaps customers are finally realizing that aluminized steel has no place on modern exhaust systems.
SUPERCHARGED RED ROCKET ------------------Master-Moderator
Joined: May 11, 2006
Posts: 10,648
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From: Carnegie, PA
Although T409SS, is stronger than T304SS. If I'm not mistaken, doesn't T409SS eventually rust through 
Last edited by m05fastbackGT; Jan 5, 2009 at 05:29 PM.
Shelby GT500 Member
Joined: October 9, 2006
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From: It's tough in the jungle !
GT Member
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From: Omaha, NE
i do. run them with gutted cat stock h pipe. sounds awesome. checkout vids of my car at http://www.youtube.com/commbubba19
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From: Wake County, NC
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