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  #1  
Old 02-22-2000, 07:29 PM
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Join Date: Jul 1999
Posts: 203
Question Why Does My 93 F-150 Have 2-Cats On One Pipe?

Ok I was looking at my F150s exhaust while it was up on a rack today and I noticed that it has two catalytic convertors on it. But it's only a single pipe not true duals. One of them is small the other is pretty big. Whats the purpose of the small one?

Thanks

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1993 Ford F-150
Kustom Kreations Package
2WD, 5.0 (302), AOD, 3.55

K&N Drop In, Superchip, Dual 2.25" Exhaust,TransGO Shift Kit & Pirelli Scorpion Zeros!

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  #2  
Old 02-23-2000, 11:05 PM
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Join Date: Jul 1999
Posts: 203
Question

Anyone?
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  #3  
Old 02-24-2000, 12:32 AM
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Join Date: Nov 1999
Location: Orange County, CA
Posts: 319
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I don't know about trucks. but my mustang had 2 cats on each pipe. many stang owners went and swapped them for aftermarket single cats for better flow.

My best guess is for extra emissions

Robert

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99 F150 Xtracab 4X4 XLT
5.4 liter Flairside
3.73 gears
all stock for now
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  #4  
Old 02-24-2000, 10:38 AM
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Join Date: Jan 2000
Location: Shakopee, MN
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The first is a pre-converter. Supposedly it was supposed to be extra emmissions. It's perfectly legal to replace it with one unit though. Had the same thing on my 93 and 86.


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99 XLT 5.4L Ext Cab 4x4 ORP - 3.55LS, custom grey/blue leather seats and wood accents - all the mods come tax rebate day!
1993 XLT SC 4x4 XLT 351 AT
1977 1/2 F250 4x4 "Low Boy" 400-4spd
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  #5  
Old 02-24-2000, 11:24 AM
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Join Date: Aug 1999
Location: Clemson SC US of A
Vehicle: 2005 Ford F-150
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Are you a part of the Ford cat breeding program? Click the image to open in full size.

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97 F-150 SC Lariat, Styleside, White over Gold, 4.6L (Windsor), Automatic, 3.55 rear end, electronic 4X4, w/ every option of Lariat and ORP packages except the 17" wheels (I even got the OR decals now!) MOD's so far: K&N air box mod, Gibson Super Truck, clear Bugflector II, Leer TSC 600 hard cover, Bridgestone Dueler OWL ATP 265/75 R-16's, TrailMaster Invader N7 shocks, Smittybilt step bars, Ford moulded mud guards, "White-white" head lamps, Cloud Rider Design's SS Grill and bumper opening, Bosch Platinum + 4's, Hayden 30K+ Tranny Cooler,Class III Reece load distributing hitch system, full wiring including trailer battery charging system, Escort Sensor II Brake controller, Superchip Click the image to open in full size.
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[This message has been edited by cphilip (edited 02-24-2000).]
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  #6  
Old 02-24-2000, 02:10 PM
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Join Date: Nov 1998
Location: Windsor, ON, Canada
Vehicle: 1994 Ford F150
Posts: 729
Exclamation

I had the samething on my '87 and '94. I was told the first one (smaller) is a resonator and the second one is the cataltic converter. The mechanic that changed the one out on the '87 said that and the new one that went on only had the one combined (assuming) into the one cat. BTW after the new one went on, a lot better take off (seat of pants) to the truck. But made my own exhaust choice of exhaust about 1 year before cat change and that helpped too. Put a 351 muffler on (single in, dual out) and added the dual tails with chrome tips. Nice look and better take off, might think of that combo instead of true duals. Only cost around $250 at a local muffler shop.

Have Fun & Keep on Truckin'
Dean

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1994 F-150 XLT Supercab, Long Box, 302 EFI, Automatic, Royal Blue in and out, Captain Chairs. Chrome Rims 15x8's, Michelin LTX M/S 105S 235/75R15 (Summer), OEM Aluminum Rims 15x8's, Michelin LTX M/S 108S (Winter), Lightly Tinted, Soft Tonneau Cover, Ford Receiver Hitch Cover & Lock, Alpine CDM-7829 Head Unit, PPI 4800 Amplifier, Kicker 10" Solo Baric Sub with Custom Box and Kicker Impulse 6.5 Mid & Tweets.


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  #7  
Old 02-24-2000, 04:21 PM
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Yep its a pre-heater, pre-convertor, whatever. I doubt it does much.

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1993 F-150 302/e4od/355 Limited slip. dual exhuast w/o mufflers, 2 1/4" pipes, Echo Tips, Summit Racing headers, accel plugs/wires(8.6mm)/rotor/cap, hypertech powermodule, 4 degree advance,Blaster Coil,MSd 6A Ignition, TPS Mod,hopefully roller rockers in the future,possible 4:10 gear swap 5% dark tint, Ford Bed mat, Bundy Chrome Drop bumper, Wrap-around bug deflector, 2-tone tan/brown. Alpine cd player and Pioneer speakers, with tweeters No room for anything else.

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Old 02-24-2000, 04:21 PM


 
 
 
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