1990 LX Stock Flowmaster size?

Ourobos · May 6, 2004

I have a 1990 LX 5.0, and am looking to upgrade my 2 1/4 in. exhaust throughout. When I got under it, I see that my mufflers are 2 1/2 in. Flowmasters. Are these stock? And if so, what are they, two chamber, etc?
Anyone know?

Thanks

Gearbanger 101 · May 6, 2004

If they're 2 1/2 inch, they're not stock.
As for which muffler you've got, you're going to have to break out the tape measure. 2-chambers will have a 13' long case and 3-chambers will have a 17' long case.

2NDTIME · May 6, 2004

Its funny you would ask if the flowmasters are stock.....you would almost think so, every fox body on the road either has flows, or had them at one point.

ninety15.0 · May 6, 2004

HAHA...yea stock size is 2.25" and anything that is a flowmaster is not stock. You can also tell just from the shape of the muffler. flowmasters are more square looking than the stock muffs which are more of a conventional oval shape. good luck man!

SmockDoiley · May 6, 2004

I guess I would have known it wasnt stock when I saw the word Flowmaster on it, but thats just me. Is the whole exhaust 2.5 inch or did they just slap 2.5 inch flows on 2.25 inch pipes. If its the ladder then its ghetto and it has to go.

90_Red_LX · May 6, 2004

Measure the pipes with a tape measure. It could be a 2.5"-2.25" reducer.

Ourobos · May 7, 2004

Yeah, it's ghetto. 2 1/4 throughout, except the 2 1/2 flows. And they are welded to the tailpipes and h-pipe. I am going to cut them right behind the welds. I already have mac 1 5/8 long tubes, and Dr. Gas X-pipe, both 2 1/2, so I am going to use these, as I figure they are the two chamber I wanted. I was just about to buy some too. Can't say enough for inspecting your setup before you buy something new for it. All I need now is 2 1/2 Tailpipes. Thanks for the replies!

Gearbanger 101 · May 7, 2004

Ourobos said:
All I need now is 2 1/2 Tailpipes. Thanks for the replies!

Mac sells theirs as a bolt on that attach right over the axle. So you can buy them separate. I've got a Mac System on mine. They're 5 years old now and are finally just starting to show a little rust. But they were very reasonably priced.

cjman15 · May 7, 2004

Yeah, gotta love the Flows... it's almost mandatory on foxes these days... you ain't cool if you ain't got flows...haha talk about peer pressure!!

1990 LX Stock Flowmaster size?

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