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  #1  
Old 07-06-2011, 09:47 AM
SpitfireEMT SpitfireEMT is offline
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Default Diameter question

I am going to be redoing my exhaust from the heads back in the spring. My plan is to run JBA headers (1 5/8" primaries), down to 2" pipe, high flow cat on each, then into an x-pipe and then run straight back to where they currently dump. My questions is: with ported alabama heads, how small does the pipe need to be to provide adequate back pressure to keep my bottom end torque? is 2" too small or can I run 2 1/2" and still be okay? I already have around 40' of 2 1/2" laying around the shop.
Thoughts??
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2000 XLT 4x4, 4dr ext cab, 4.0L OHV, 4.10 LSD
265/75/16 Goodyear Duratracs
Mountaineer seats, Expo OHC
2003 EDGE front clip conversion
133rwhp/192rwtq-->6-28-11

1969 Mercury Cougar
351W, FMX, 3:1 open diff in a Ford 9"
Undergoing restoration
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  #2  
Old 07-06-2011, 09:54 AM
doyouquaxu doyouquaxu is offline
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Default Re: Diameter question

IMO don't waste your money on high flow cats, the ones on your truck flow just as well.
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  #3  
Old 07-06-2011, 09:58 AM
SpitfireEMT SpitfireEMT is offline
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Default Re: Diameter question

I dont think putting 140k mile cats on a freshly rebuilt engine is a great idea. Maybe thats just me tho.
__________________
2000 XLT 4x4, 4dr ext cab, 4.0L OHV, 4.10 LSD
265/75/16 Goodyear Duratracs
Mountaineer seats, Expo OHC
2003 EDGE front clip conversion
133rwhp/192rwtq-->6-28-11

1969 Mercury Cougar
351W, FMX, 3:1 open diff in a Ford 9"
Undergoing restoration
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  #4  
Old 07-06-2011, 10:02 AM
doyouquaxu doyouquaxu is offline
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Default Re: Diameter question

Quote:
Originally Posted by SpitfireEMT View Post
I dont think putting 140k mile cats on a freshly rebuilt engine is a great idea. Maybe thats just me tho.
don't cloud the issue with facts... lol
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  #5  
Old 07-06-2011, 10:28 AM
SpitfireEMT SpitfireEMT is offline
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Default Re: Diameter question

Depending on what pipe size is needed, I may run straight pipes. The truck will be a strictly off road vehicle next summer, so I dont have to worry about the treehuggers getting snippy at me driving it down the road. I would guess 2~2 1/2 would be sufficient to keep my bottom end. Didnt know if anyone had messed with it or not.
__________________
2000 XLT 4x4, 4dr ext cab, 4.0L OHV, 4.10 LSD
265/75/16 Goodyear Duratracs
Mountaineer seats, Expo OHC
2003 EDGE front clip conversion
133rwhp/192rwtq-->6-28-11

1969 Mercury Cougar
351W, FMX, 3:1 open diff in a Ford 9"
Undergoing restoration
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