I have a 2001 F150 extended cab 4wd, 4.6, 5 speed. I currently have a K&N FIPK 2 kit and a superchip from www.superchip.com and a true duel exhaust.

I am wanting to do something with my Catalytic Converters. I saw where Troyer Performance offers a High Flow Cat that I can replace my current cat's with. It says that I can put two High Flow Cats in place of the four I have now, and this will not mess up the O2 sensors, which will not affect my engine. Correct?

I was wondering if any one offers a Dual In, Dual Out catalytic Converter. I had a friend that put one on his Dodge. Is there a big difference in having two separate High Flow Cats, one on each side or one Dual In, Dual Out Cat.

If I did change my cats, what kind of performance can I expect?
Should the sound of my exhaust change?

Any Info will help! Thanks!

Scott Gentry
Tazewell, VA

 

Whats up Scott
I have a 98 F150 4x4 and i had problems with my catalytic converters, they completly got clogged and would make my engine stall. I took it to a muffler shop and they said they could replace them for 1,550 bucks. Im in college and i really dont have any extra money so i did what any poor man would do. I cut them out and replaced the tubing. now i have a mean sound because of the flowmasters and no cats. Right away i felt the throttle response and when i gunned it the truck just threw me against the seat. It Matters if your state has heavy inspections on that, if not your good to go

 

Are you sure you have 4 cats? For a 4.6L 4x4 that doesn't sound right. The only trucks I know of with 4 cats (2 in line on each side) are the supercharged trucks. I may be wrong, but I think that's it.

You should have only two cats. One on each side of the truck. You couldn't use a DIDO (dual in, dual out) cat unless you did a lot of pipe modification.

Like Whitelarie said, cutting them out and replacing with straight tubing would be the absolute best option. This is strictly forbidden in the U.S. (all 50 states) by the Environmental Protection Agency. But if you're not required to do inspections, they'll never know.

Technically you're not allowed to do anything to a cat that's not broken. To remain somewhat legal you could just buy two of Mike Troyer's high-flow cats and replace the two that are on your truck now. This requires a saw (preferably a powered one) and a welder (or exhaust tape/repair if you want to go cheap, but this is bad for longevity). Other than clearance issues, which depends on your truck, it's a simple remove and replace operation.

Good luck and happy trucking.

 

Thanks for the reply guys, I have already changed my exhaust system 2 times and I have already spent alot of money. I would like to change it one more time and do it right this time.

This is what I am thinking about doing, tell me if it sounds alright!

1st-----Replace my stock 4 cats with a set of 2 high flow cats. One on each side.
2nd----Have a true dual set up with a H-pipe. (But I have a problem, What is a H-pipe?)

I am kind of new to all of this. Any info will help. Thanks

Scott

 

An H-pipe is a method by which you connect/bridge the two exhaust pipes without combining them (as with a Y-pipe). Basically, when you lay the pipe out flat and look from overhead it would look like an "H" (hence, the name). Dual-in, dual-out, but also bridged. This bridging allows cross-flow and positive backpressure that a "true dual" system lacks, and allows use of a dual-in muffler.

The Y-pipe (which is on most F150 stock systems) makes for a lack of flow capacity at the Y connection and provides too much backpressure, reducing power.

I hope this explains it. If not, I'm sure someone else can help out, too, if I missed anything.

-Jeff

 

Jeff
You explained it very well, Thanks!
My last question is------Where do I get an "H" pipe? Shoud my local muffler shop carry them? Or Would I have to order it from someone, like "Mike Troyer"?

Are the High Flow Cats worth putting on?

Thanks

Scott

 

To add an H-pipe or an X-pipe (same principle) to a non-Lightning/Harley F-150 would probably require a custom job. You don't want this done by just any muffler shop, though. Find a good shop that specializes in performance systems. If you're looking to spend some money they'll be able to design an entire system for you centered around a good performance dual-in dual-out muffler. You might well call Mike Troyer and ask if he has any suggestions, since he may have encountered such an upgrade before and may actually have a kit, or be able to build one for you.

As for the high-flow cats, I'd do it if I had the money and time to install them. My step-father has a welder, so I could easily do it myself, but I'd have to find the time, and I'd prefer to do headers and cats at the same time. I'm not sure exactly what kind of performance is gained since I've never done it myself, but at under $200 for both cats, why not?

Whatever you decide, let us know how it turns out, and be sure to start a gallery.

-Jeff