2002, 5.4, ATI Procharger-12PSI, Which Exhaust?
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From: Buffalo, NY
2002, 5.4, ATI Procharger-12PSI, Which Exhaust?
2002 F-150 Supercab Offroad, 5.4, ATI Procharger with 12# Boost (and 42lb injectors, 90mm MAF, Custom Tuning)...............to not "choke the system I am considering:
High Flow Cats and Cat Back Exhaust.....I assume all 4 cats should be High Flow, whcih exhaust would be a good choice? I am keeping the stock manifolds and have no interest in headers.
Now, don't kill me, but I do not want it to really get much louder. I realize it will get a bit louder but what is a good choice for cats and cat-back? Any ideas for my needs?
High Flow Cats and Cat Back Exhaust.....I assume all 4 cats should be High Flow, whcih exhaust would be a good choice? I am keeping the stock manifolds and have no interest in headers.
Now, don't kill me, but I do not want it to really get much louder. I realize it will get a bit louder but what is a good choice for cats and cat-back? Any ideas for my needs?
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From: Nawlins
Dont replace all 4 cats, you only need to replace 2 of them. Get Magnaflow high flow cats. and true dual it from there with Magnaflow mufflers and a X-pipe. I would also look into headers, the KOOKS/JDM long tube headers seem to be the best, if you are going to have such a nice sysytem, so do it all right, and please dont use Flowmaster. With an engine making that much power, I would definately want the long tube headers.
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Intel
Thanks man for the reply. For some reason when I typed this I had this suspicion maybe only 2 cats should be chaged but wasn't sure. In my Vette when I did Long Tubes it actually deleted the two "pup cats" and the main cats remain. Anyway, sorry for the rant.
When you say "True dual", does that mean replace the two Cats with High Flow, then replace the Muflfer and split the pipes out of the muffler, i.e. SI/DO?????????? I have had such conflicting reports about the headers. Do you say only 2 High Flow Cats get replaced because the Long Tubes delete 2 of the Cats? Or is it simply "Only" 2 need to be replaced.
I have read so much this weekend my head is spinning.
I was thinking, High-Flow Cats, Possibly a Magnaflow Muffler/X-pipe, then dual pipes out of the muffler....not sure if I want to go straight back with the pipes out the rear or off to the side "behind" the rear tires.
I really don't want to lose the spare either.
Thanks man for the reply. For some reason when I typed this I had this suspicion maybe only 2 cats should be chaged but wasn't sure. In my Vette when I did Long Tubes it actually deleted the two "pup cats" and the main cats remain. Anyway, sorry for the rant.
When you say "True dual", does that mean replace the two Cats with High Flow, then replace the Muflfer and split the pipes out of the muffler, i.e. SI/DO?????????? I have had such conflicting reports about the headers. Do you say only 2 High Flow Cats get replaced because the Long Tubes delete 2 of the Cats? Or is it simply "Only" 2 need to be replaced.
I have read so much this weekend my head is spinning.
I was thinking, High-Flow Cats, Possibly a Magnaflow Muffler/X-pipe, then dual pipes out of the muffler....not sure if I want to go straight back with the pipes out the rear or off to the side "behind" the rear tires.
I really don't want to lose the spare either.
Originally posted by Intel486
Dont replace all 4 cats, you only need to replace 2 of them. Get Magnaflow high flow cats. and true dual it from there with Magnaflow mufflers and a X-pipe. I would also look into headers, the KOOKS/JDM long tube headers seem to be the best, if you are going to have such a nice sysytem, so do it all right, and please dont use Flowmaster. With an engine making that much power, I would definately want the long tube headers.
Dont replace all 4 cats, you only need to replace 2 of them. Get Magnaflow high flow cats. and true dual it from there with Magnaflow mufflers and a X-pipe. I would also look into headers, the KOOKS/JDM long tube headers seem to be the best, if you are going to have such a nice sysytem, so do it all right, and please dont use Flowmaster. With an engine making that much power, I would definately want the long tube headers.
Last edited by KeithG; Feb 22, 2003 at 09:10 AM.
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From: New Orleans
This is Beastie, I posted the above response, I was just simply on Intels computer. On the newer trucks like you have, you can get rid of all 4 of the cats, and just replace them with 2 Magnaflow high flow cats. On your truck the front 2 cats are just "pre heaters" for the rear 2. I know that if you replace all 4 cats with 2 Magnaflow cats, you wont have any problems with the o2 sensors. Sorry if this sounds confusing, but I dont know how to reword it. Essentially replace all 4 of your cats with 2 magnaflow cats, then the exhaust bank on the drivers side will have to cross over to the passenger side, then conenct the 2 banks with an x-pipe, and then 2 mufflers, and make it exit wherever you want. I have a pre 97 F-50, but I have everything I am telling you to get minus the headers, but those are on the way. Look in my gallery for pics of my setup. Everything should be very similar, I essentially have a gen 2 Lightning setup.
I also have a little drawing of a true dual setup, it will give you an idea of the layout, dont mind the other picture that it has, that is the way the exhaust is setup on the pre 97s
I also have a little drawing of a true dual setup, it will give you an idea of the layout, dont mind the other picture that it has, that is the way the exhaust is setup on the pre 97s
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From: Virginia Beach, VA
Keep in mind that a boosted application is a different beast than a naturally aspirated application. Even under boost there is such a thing as too much.
Here's a great thread that makes this point. Though it is a Magnacharger (positive displacement) blower you can see how a "better exhaust" costs nothing more than money and HP in some cases. X Pipe bad boy exhaust
IMO if you aren't doing headers and a full system, you might be better off not going insane on exhaust mods, and focusing more on tune and the blower setup mods. The ATI boost curve is such that retaining some of the low end torque might take advantage of a less open system. Once the boost starts to build, the blower will overcome the possible restrictions at higher revs.
Personally I would pick a decent flowing cat back and go from there. Note in the above link that stock cats are still in place, as they are on many blower apps making even more HP.
I would find a good tuner, and spend the extra savings on a good custom "hands on" tune for the blower. What you save in exhaust games would likely pay back better with this approach. You might want to do a search for "BTBFord".... he had some custom hands on tuning done in NY, though I'm not sure it was in your area.
Here's a great thread that makes this point. Though it is a Magnacharger (positive displacement) blower you can see how a "better exhaust" costs nothing more than money and HP in some cases. X Pipe bad boy exhaust
IMO if you aren't doing headers and a full system, you might be better off not going insane on exhaust mods, and focusing more on tune and the blower setup mods. The ATI boost curve is such that retaining some of the low end torque might take advantage of a less open system. Once the boost starts to build, the blower will overcome the possible restrictions at higher revs.
Personally I would pick a decent flowing cat back and go from there. Note in the above link that stock cats are still in place, as they are on many blower apps making even more HP.
I would find a good tuner, and spend the extra savings on a good custom "hands on" tune for the blower. What you save in exhaust games would likely pay back better with this approach. You might want to do a search for "BTBFord".... he had some custom hands on tuning done in NY, though I'm not sure it was in your area.
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Signmaster
Thank you for your response. I agree with your analysis and suggestions. I think what I may do is leave the 2 Pre-Cats and also the 2 Main-Cats and do the muffler back. I think I may do a DI/DO muffler and have the two pipes exit the rear. Keeping the stock cats in place will help, IMO, with the low-end torque issue while still allowing the air to flwo a bit freer once it hits the muffler.
I am having custom tuning done here where I live. In fact, Bob Kennedy's shop is literaly 3 minutes from my house. Bob is doing the custom tune on his dyno. He did all of BTBFord's work on his incredible truck. I am very lucky to have Bob so close.
Thank you for your response. I agree with your analysis and suggestions. I think what I may do is leave the 2 Pre-Cats and also the 2 Main-Cats and do the muffler back. I think I may do a DI/DO muffler and have the two pipes exit the rear. Keeping the stock cats in place will help, IMO, with the low-end torque issue while still allowing the air to flwo a bit freer once it hits the muffler.
I am having custom tuning done here where I live. In fact, Bob Kennedy's shop is literaly 3 minutes from my house. Bob is doing the custom tune on his dyno. He did all of BTBFord's work on his incredible truck. I am very lucky to have Bob so close.
Originally posted by signmaster
Keep in mind that a boosted application is a different beast than a naturally aspirated application. Even under boost there is such a thing as too much.
Here's a great thread that makes this point. Though it is a Magnacharger (positive displacement) blower you can see how a "better exhaust" costs nothing more than money and HP in some cases. X Pipe bad boy exhaust
IMO if you aren't doing headers and a full system, you might be better off not going insane on exhaust mods, and focusing more on tune and the blower setup mods. The ATI boost curve is such that retaining some of the low end torque might take advantage of a less open system. Once the boost starts to build, the blower will overcome the possible restrictions at higher revs.
Personally I would pick a decent flowing cat back and go from there. Note in the above link that stock cats are still in place, as they are on many blower apps making even more HP.
I would find a good tuner, and spend the extra savings on a good custom "hands on" tune for the blower. What you save in exhaust games would likely pay back better with this approach. You might want to do a search for "BTBFord".... he had some custom hands on tuning done in NY, though I'm not sure it was in your area.
Keep in mind that a boosted application is a different beast than a naturally aspirated application. Even under boost there is such a thing as too much.
Here's a great thread that makes this point. Though it is a Magnacharger (positive displacement) blower you can see how a "better exhaust" costs nothing more than money and HP in some cases. X Pipe bad boy exhaust
IMO if you aren't doing headers and a full system, you might be better off not going insane on exhaust mods, and focusing more on tune and the blower setup mods. The ATI boost curve is such that retaining some of the low end torque might take advantage of a less open system. Once the boost starts to build, the blower will overcome the possible restrictions at higher revs.
Personally I would pick a decent flowing cat back and go from there. Note in the above link that stock cats are still in place, as they are on many blower apps making even more HP.
I would find a good tuner, and spend the extra savings on a good custom "hands on" tune for the blower. What you save in exhaust games would likely pay back better with this approach. You might want to do a search for "BTBFord".... he had some custom hands on tuning done in NY, though I'm not sure it was in your area.