hey guys.......wazzz up. Went 2 a muff shop 2day. I wanted to get my xhuast changed from the pipes xiting the back 2 a side xit. 1st ?, why does ford need 4 converters for their xhaust? I was thinking about having them put in a dual 2 1/4" inlet/outlet muffler. I thought instead of the driver side pipe going into the pass side pipe, i would make it true dual. The only catch would be, that they would have to eliminate the last converter, the one after the o2 sensor. Thats were the new muff would go, then the pipes would exit the pass side. 2nd ?, would having true duals make a difference, I'm not looking for huge gains, i'm guessing 2-3 increase in hp. im anticipating what it would sound like. Also wondering if removing that converter, would cause my mpg to decrease or maybe cause any cel to come on? The shops wants $250 but they wanted to install a dynomax...yuuck! I ask them how much If I got my own muff and told me $200. Not bad..ehhhh? Found a magnaflow dual in/out for $80. I currently have a borla x. Sounds awesome but cant find dual in/out from them. Any advise or suggestions would be appreciated.

 

This question has been asked and answered many times -- here we go again, lol.

To make the catalyst more efficient, Ford made it LONGER. The first CATS heat up the exhaust gas more (the catalytic reaction makes heat) as well as doing some of the conversion and they are called "preheater CATS".

The "big CAT" does the remaining gas conversion using hotter exhaust from the preheaters.

If you try to eliminate them, you will most likely be in violation of current (or future) emission control laws, and you'll get a CEL light unless you put something on that is as effective in it's place.

Also, the Ford CATS are fairly high flow (most CATS are these days) so replacing it with an aftermarket one probably won't get you much benefit. Best you spend a little to get what you want from the CAT back, and put the rest on some other mods.

 

leave your borla on, it aint much different than magnaflow anyway. and you will gain absolutly nothing by making true duals. prolly loose some if anything

 

I'm not trying to replace all of them, just the last one, the "big" one as refered, to make room for the muffler.

 

i still say no it wont be worth it.

 

coll man thanks........borla sounds so good the older it gets, has a nice rumble to it. Yeah, I'm probably not gonna mess with it. Was just bored one afternoon..

 

Perhaps the shop can just relocate the original one closer to the engine? Be careful to preserve the oxygen sensors and remove them when you are welding near them to keep them from being damaged. They you won't have the expense of a new one, and you'll be using one that is "right" for the emission control system -- probably cheaper to do also.

You know, on most trucks there's quite a bit of pipe between the muffler and the CAT allowing for bigger mufflers just by cutting down the pipe. Do you have a standard cab or something that you can't do that? You have no description of your truck so it's hard to advise you.

 

Hey zabeard, how much did you spend on your suspension upgrades, I love how your truck sits, thats how I want mine to look.....

 

yeah I'm not sure how to write a description of my truck, pretty new to the forum. its an xtended cab w/the mini doors.

 

Oh, well then you should be able to put muffler back further towards the CAT by using a shorter pipe between them. I guess it's about 2 to 3 feet long.

 

prolly 500 not including wheels and tires. thanks btw

 

500? wow, can you tell me what all you have, i know your wheels and tires set you back @1500, if I recall......

 

wheels and tires were 950.

i have
KYB monomax shocks(not sure that matters too much)$$$
AAL(inplace of 2.5 inch block) 30$
1 inch block 45$
torsion crank free
body lift 215$