Flowmaster part # ?

R

Riker

New Member

Sep 6, 2005

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Sep 6, 2005

#1

• Sep 6, 2005

• #1

Hello,

I'm new here to the forum and have owned a few mustangs in the past. Mainly my 71 Mach1. My girlfriend picked up a 2001 GT and wants some flowmaster mufflers put on it. Her birthday is on the 15th and I'm going to get this for her. She's not crazy about going fast, but wants it to sound good. Is 42541 the correct Flowmaster 40 series muffler to replace the stock mufflers with?

Thanks
W.K.

 

timeless2

Vi Veri Veni Versum Vicus Vici

Admin Dude

Nov 29, 1999

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the Shadow Gallery

Sep 6, 2005

#2

• Sep 6, 2005

• #2

I don't know the exact part #, but can tell you there are (3) 40 series mufflers.

Originals: loudest (might sound best with stock midpipe)
Supers: medium loud
Delta Flows: least loud, least drone. I have these and they are perfect with my off-road H pipe. Not overly obnoxious, but very noticeable.

 

Mossberg

Active Member

Jul 21, 2003

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ATL, Shawty

Sep 6, 2005

#3

• Sep 6, 2005

• #3

The Flowmaster site has the application guide that should show you the correct part #s.

 

1bad04GT

New Member

Jul 6, 2004

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Lubbock, Texas

Sep 6, 2005

#4

• Sep 6, 2005

• #4

42443 are the original 40s

 

twogts4us

15 Year Member

Apr 1, 2004

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Dunedin, FL

Sep 6, 2005

#5

• Sep 6, 2005

• #5

1bad04GT said:

42443 are the original 40s

Click to expand...

You can also do 42543, the same muffler, but 2.5" rather than the 42443's 2.25". OEM is 2.25", but any muffler shop can weld the 2.5" in without a problem. The SN-95 Mustang (94-04) uses a offset/offset muffler, whereas the inlet and outlet are on opposite sides, offset from the center. See pic below-