3 months ago I bought a F-150 1993, 302. I want flowmasters. I thought I had just stock dual exhaust. I looked under the truck and the muffler said flowmaster. I was glad yet also pissed cause I no good sound, only a little bit. Brought it to a muffler shop asked why don't I have any sound. They said the pipe coming from the cat-back( didn't know I had a cat-back till I brought it in that day, so that was cool) to the muffler was too small, and I had no tips coming out the two dual ends which will make more of an echo to the exhaust. They told me if they wanted to get a bigger pipe connecting from the converter to the muffler for more air flow, and adding two 3 1/2 inch tips will cost around $90. Is it worth it?

 

There is distinctly a difference. I had duals w/o mufflers and those tips. Made good noise, but I eventually got tired of the noise and swapped for a edlebrock muffler and have enjoyed it.


1993 F-150
1989 F-150 4x4

(http://briefcase.yahoo.com/toydestroyer1)

 

There is distinctly a difference. I had duals w/o mufflers and those tips. Made good noise, but I eventually got tired of the noise and swapped for a edlebrock muffler and have enjoyed it.



1993 F-150
1989 F-150 4x4

(http://briefcase.yahoo.com/toydestroyer1)

 

Is it worth it hell ya! I have I similar setup to what you explained. I took it to an exhaust shop cause I was having problems passing emissions; he took the old stock system off and removed both catalytic converters. He then hollowed out the original first cat then reinstalled it, and then installed a hi-Flow cat in place of the stock second one with a 3 inch pipe coming from the cat going to the muffler (its a vortex), from there it splits into duels and exits behind the tires with 3 1/2 inch chrome tips. It sounds awesome and it’s pretty loud. It sounds really cool at about 2100 rpm cruising through town. After that was done it passed emissions with no problem. And I have not had any problem with the law yet but its all legal anyway.




Quote
"If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside."
Robert X. Cringely, InfoWorld magazine

 

madman66: was the first cat partially stopped up? did they hollow it out for lower restriction? I've wondered what that first cat really does. I'm thinking about doing the same thing. I've already removed the second one. '91 Lariat 5.0

 

Let me explain why I had this done. I took my truck into emissions testing (don’t get me started about that) it had been running kind of rough for a while but couldn’t figure out what it was, when I took it in it failed really bad, not even close. I took it to my brother’s friends shop, and he determined it to be the fuel regulator it was pushing 90 psi of fuel into the engine wow! He also said the cats may have UN burned fuel in them or may be clogged up. So I took it to an exhaust shop. I explained what had happened with the regulator, and he looked up some prices for a new pre converter system. The system was the whole thing from the manifold back up to the second converter. He could not find it in his book he said they done make them for short box reg cab he had to order it from ford; it was expensive around $700 or $800 or so, I don’t remember. He said it wouldn’t be worth it, so he explained he would open up the pre converter and check if it was clogged, if it was he would "gut" it out, but it was not bad but he gut it anyway for more air flow. He said you don’t really need the first one anyway. He than replaced the second converter with a new hi flow piece because the new muffler had a 3 inch opening so he had to use a converter with a 3 inch exit, fine by me!

I am not sure what the pre converter is for but I think it’s a pre heater but I’m not sure.





Quote
"If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside."
Robert X. Cringely, InfoWorld magazine

 

What all does the pre-heater have in it?


1993 F-150
1989 F-150 4x4

(http://briefcase.yahoo.com/toydestroyer1)

 

I just found this on a web site it explains what it is.

Each of the three types of converters mentioned above have a common need in order to function properly. Each needs to reach a minimum operating temperature before any emission reduction or oxidation takes place. This warm-up period immediately after a vehicle is started is when the catalytic converter is least efficient and the vehicle expels the most pollutants. Some vehicles employ a pre-converter in the exhaust system immediately after the manifold to help during this warm-up period. The pre-converter's small size and proximity to the engine allow it to heat up and start functioning in less time than the main converter. It also pre-heats the exhaust gasses and helps the main converter reach operating temperature sooner.

The pre converter has the same honey comb shape stuff as the main catalytic converter.




https://www.ford-trucks.com/dcforum/User_files/madman666/3be7a60c494a84e6.jpg
1992 Ford F150, 302, 4X4, Regular Cab, Short Box, Tonneau Cover, Duel Exhaust, 31 inch Tires