Did I get the right flex pipe?
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Senior User
Joined: Jun 2004
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From: ALCONA ONTARIO
Did I get the right flex pipe?
Bought a new exhaust flex pipe fo my 92 3.0 and noticed that the pipe diameter on the cat assy. is quite a bit larger than the new flex pipe diameter. When the 2 flanges are bolted together there will be a sudden reduction in exhaust flow right at the joint. Is this normal / correct?
Seems to me when there is a reduction in tube size it sould be a gradual taper, not an abrupt change like this?
Seems to me when there is a reduction in tube size it sould be a gradual taper, not an abrupt change like this?
Lead Driver
Joined: Sep 2003
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From: SoCal
As many have found out, the outlet on the cat is 2.25", while the pipes behind the cat are 2". However, it should not be an abrupt step-down transition; that will cause too much turbulence and back pressure. Maybe you need to get the 2.25" flex pipe, and allow the hard pipes to ramp down to 2" (or get a complete 2.25" cat-back system).
Former ******
Joined: Nov 2004
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From: Salt Lake City, Utah
The stock flex pipe is 2". which is disturbingly smaller than the diameter of the converter pipe. However, the 3.0L does fine with 2" exhaust. I agree, the sudden step down is wrong.
If you bought your flex on eBay or from most online vendors, you will find most of them are the same cheap stuff. We sell our version on eBay as well, it is better built. It costs a little more too, but it takes more investment to use an OE type hanger, double braid flex pipe, and the proper flange. Most the other stuff uses a universal flange with the wrong sized opening, and a universal gasket to go with it. Our part uses a flange that is unique to the Aerostar and Windstar. It is not used on any other Ford model.
If you bought your flex on eBay or from most online vendors, you will find most of them are the same cheap stuff. We sell our version on eBay as well, it is better built. It costs a little more too, but it takes more investment to use an OE type hanger, double braid flex pipe, and the proper flange. Most the other stuff uses a universal flange with the wrong sized opening, and a universal gasket to go with it. Our part uses a flange that is unique to the Aerostar and Windstar. It is not used on any other Ford model.
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From: ALCONA ONTARIO
Thanks guys.
The flange on the cat pipe is damaged anyway so I think I will cut it off and put in a reducer / adapter to make the transition from 2.25" down to 2" more gradual (tapered) and hopefully reduce the turbulence and back pressure.
The flange on the cat pipe is damaged anyway so I think I will cut it off and put in a reducer / adapter to make the transition from 2.25" down to 2" more gradual (tapered) and hopefully reduce the turbulence and back pressure.
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