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Unread 06-23-2010, 09:09 AM   #1
97DCZJ
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99 4.7 exhaust size?

I'm installing a Flowmaster 40 2.5" muffler later on today, but I don't know what adpaters I will need.
can anyone help me by telling me the size of my exhaust, and if you know, what adapters i exactly need?

Thanks JF!

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1997 Grand Cherokee Orvis: V8 5.2L, stock.
(Sold) 1998 Cherokee Sport: 4.0L I6, Stock.
(Sold) 1990 Cherokee: 4.0L I6, 4.5" Lift, 33" BFG's.
(Sold) 1997 Grand Cherokee Limited: V8 5.2L, 2" BB, 31" Dick Cepeks.
(Sold) 1999 Grand Cherokee Laredo: Build Thread; V8 4.7L, Stock.
(Sold) 1996 Grand Cherokee Laredo: Build Thread; V8 5.2L ,3.5" lift, 32" Tires
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Unread 06-23-2010, 09:31 AM   #2
ezflip
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The stock pipes on the 4.7 are 2.5"
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Unread 06-23-2010, 09:33 AM   #3
rm2001wj
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I can't be sure about your 99, but my 01 had a 2.25 inch pipe between the cat and muffler and then 2.5 inch after the muffler. So, you might want to get an adapter for the muffler inlet.
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Unread 06-23-2010, 09:51 AM   #4
97DCZJ
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alright thanks guys
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1997 Grand Cherokee Orvis: V8 5.2L, stock.
(Sold) 1998 Cherokee Sport: 4.0L I6, Stock.
(Sold) 1990 Cherokee: 4.0L I6, 4.5" Lift, 33" BFG's.
(Sold) 1997 Grand Cherokee Limited: V8 5.2L, 2" BB, 31" Dick Cepeks.
(Sold) 1999 Grand Cherokee Laredo: Build Thread; V8 4.7L, Stock.
(Sold) 1996 Grand Cherokee Laredo: Build Thread; V8 5.2L ,3.5" lift, 32" Tires
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Unread 06-23-2010, 10:04 AM   #5
jtsjeep99
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If you got the flowmaster kit for your WJ, it should come with the adapter. Mine did. and I believe it is 2.25 from the cat to the muffler.
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Unread 06-23-2010, 10:06 AM   #6
97DCZJ
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Nah It's a used FM 40 from my friends 96 Impala SS.

So I'll need a 2.25 ID or OD to a 2.5 ID or OD?
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1997 Grand Cherokee Orvis: V8 5.2L, stock.
(Sold) 1998 Cherokee Sport: 4.0L I6, Stock.
(Sold) 1990 Cherokee: 4.0L I6, 4.5" Lift, 33" BFG's.
(Sold) 1997 Grand Cherokee Limited: V8 5.2L, 2" BB, 31" Dick Cepeks.
(Sold) 1999 Grand Cherokee Laredo: Build Thread; V8 4.7L, Stock.
(Sold) 1996 Grand Cherokee Laredo: Build Thread; V8 5.2L ,3.5" lift, 32" Tires
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Unread 06-23-2010, 11:45 AM   #7
rm2001wj
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It would be 2.25 ID for connection to the pipe from the cat. But, since the muffler is used, it would depend on whether the other end has to go over a piece of 2.5 pipe welded to the muffler inlet (2.5 ID) or will be able to slip into the muffler inlet (2.5 OD).
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