That darn second cat....
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Freshman User
Joined: May 2001
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That darn second cat....
I am considering running dual rears on my baby, but I am a little hesitant to do it. I hear a lot of the 6's with them and it seems like if you're not accelerating they won't talk to you.
Who makes a good, high flow single to replace the two cats, because I think this is why they don't have that constant aggressive sound. Also, I see the name flowmaster thrown around a lot, is this the brand to have for exhaust??
1995 F-150
4.9 I-6 M4od
3" Sky Jacker
31-11.5-r15
Who makes a good, high flow single to replace the two cats, because I think this is why they don't have that constant aggressive sound. Also, I see the name flowmaster thrown around a lot, is this the brand to have for exhaust??
1995 F-150
4.9 I-6 M4od
3" Sky Jacker
31-11.5-r15
Senior User
Joined: Jul 2000
Posts: 429
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From: Lima, OH
That darn second cat....
You can get a cat. from a few different places. So far, CatCo has been the cheapest I've seen ($50) for a 3" in/3" out with air tube. You can pick one up through Summit Racing.
As for Flowmaster, I have one of their cat-back systems, and can attest to their quality. One bad thing though is that it comes with a rather quiet 3-chamber muffler (50 or 70 Series if I recall right), so if you're looking for that deep, aggressive tone plan to get a different muffler like their 40 Series 2-chambers.
TrailDawg
https://www.ford-trucks.com/dcforum/User_files/3aaa4bac6f539876.jpg
1993 F150 2WD
6" Lift w/35's
And STILL waiting to get my 4.30 gears installed!!!!
http://www.geocities.com/ProjectTrailDawg
As for Flowmaster, I have one of their cat-back systems, and can attest to their quality. One bad thing though is that it comes with a rather quiet 3-chamber muffler (50 or 70 Series if I recall right), so if you're looking for that deep, aggressive tone plan to get a different muffler like their 40 Series 2-chambers.
TrailDawg
https://www.ford-trucks.com/dcforum/User_files/3aaa4bac6f539876.jpg
1993 F150 2WD
6" Lift w/35's
And STILL waiting to get my 4.30 gears installed!!!!
http://www.geocities.com/ProjectTrailDawg
Senior User
Joined: Dec 2000
Posts: 149
Likes: 1
That darn second cat....
The Flowmaster force II kit comes with the 70 series muffler ( most tame). I remember cuz I was disappointed when I got it. It's REALLY mellow. can hear it a little past idle, and I was driving by a friend who said it was fairly loud, but I'm gonna got to a 30 (second quietest) series or even a 50. Think th others would resonate too much for low rpm-ing, like traffic.
1989 F-150 : 5.0, shorty headers, Flowmaster cat-back, K&N filtercharger intake, March pulleys, MSD-6T, soon to be Mass-Air...doesn't know she's not a Mustang
1989 F-150 : 5.0, shorty headers, Flowmaster cat-back, K&N filtercharger intake, March pulleys, MSD-6T, soon to be Mass-Air...doesn't know she's not a Mustang
Senior User
Joined: Jul 2000
Posts: 429
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From: Lima, OH
That darn second cat....
it all depends on how you do it. So far the popular way to do it is get a 3" in/out cat, then mate it to one of the various aftermarket 3" cat-back systems. A 3" pipe in equivelent in flow to 2-2.25" pipes (whuch is what's coming off your manifolds). To make the 3" cat work though, you will have to have a muffler shop bend you new down pipes from the manifolds that combine into a single 3" at their end. In essense, you're makeing a Y-collector that you can directoy attach your cat to.
As for compression (I'm assuming you mean backpressure), the hi-flow cat will reduce tons compared to the stock setup. Also, the 3" cat-back kit will reduce it even further with the larger diameter pipe, as the stock single exhaust was a tiny 2.25" all the way back.
TrailDawg
https://www.ford-trucks.com/dcforum/User_files/3aaa4bac6f539876.jpg
1993 F150 2WD
6" Lift w/35's
Auburn Pro-Series Diff. w/4.30 gears
http://www.geocities.com/ProjectTrailDawg
As for compression (I'm assuming you mean backpressure), the hi-flow cat will reduce tons compared to the stock setup. Also, the 3" cat-back kit will reduce it even further with the larger diameter pipe, as the stock single exhaust was a tiny 2.25" all the way back.
TrailDawg
https://www.ford-trucks.com/dcforum/User_files/3aaa4bac6f539876.jpg
1993 F150 2WD
6" Lift w/35's
Auburn Pro-Series Diff. w/4.30 gears
http://www.geocities.com/ProjectTrailDawg
Senior User
Joined: Mar 2001
Posts: 150
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That darn second cat....
If you are looking to get sound out of your 300-6, try knocking the rear cat out. I did this and it made all the difference in the sound. The two cat setup is the worst ting that i have seen. Its too quiet and power robbing.
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That darn second cat....
Yeah, that's the plan I think. I'm looking at cat-back exhaust kits right now too, and wondering how difficult it would be to take up the space where the second cat would be so everything meets up. ---greenfordguy
1995 F-150 xl
3" SkyJacker
3" Performance Accessories Body Lift
31/11.50/R-15
1995 F-150 xl
3" SkyJacker
3" Performance Accessories Body Lift
31/11.50/R-15
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Senior User
Joined: Mar 2001
Posts: 150
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That darn second cat....
I would'nt just cut the second cat off. The local exhaust shop told me that if you get caught in NY it is a $2500. fine. I would just take a rod and break up the converter in the case and pull everything out. Thats all I did. Knoking the converter out does make it really loud, but once you stick a muffler on it it will quiet it down. The cat-back from JC Whitney that I have is a Y with two straight pipes to two muffler tips. The tips are basically just glasspacks. I replaced the tips with some 31/2X24 chrome angle cut ones. You would not believe the difference in sound with the muffler tips off. It's not so loud that the cops are always gonna nail ya, but loud enough that peope know when you are coming and going. I would recommend going with the cat-back from JC Whitnay and selling the muffler tips to someone and replacing them with straight pipes or chrome tips. I got mine on sale for $139. and it comes with everything to mount it.
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Freshman User
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That darn second cat....
Well, just knocking it out isn't really the plan. I do want to keep it street legal as it is not just for muddin'. I checked out the EPA's web site for emmissions regulations and found an interesting link to check out the inspection requirements for your make/model and state. http://www.epa.gov/autoemissions/howto.htm#view
Senior User
Joined: Jun 2001
Posts: 150
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From: Watertown, NY
That darn second cat....
You guy s seem to be talking about punching out the front cat and putting a single high flo cat on. How do you puch out the front cat. I have a 351w and it looks like it would be hard to punch out b/c the pipe is curved going up to it. How did you guys do it...?
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