Cat Back Exhaust

[BROKER]

What is everyone using ? How many are running dual pipes ?

 

[toocivil]

I had magnaflow, dual pipes straight out the back, on my old 99 f-150 with stainless tips. Don't go with chrome, they don't hold up like stainless. The exhaust had a nice rumble to it, but not deafining. Would like to do it to my 03 xp. Back when I put them on my truck I had the wife pissed at me for a good couple of weeks. I'm not sure if I want to go through that kind of missery again.

 

[green03]

Mine is all self-built but I basically used the same muffler that comes in the magnaflow kit. After replacing the 4 factory cats with 2 high-flow units the exaust was stupid loud at part throttle so I put a twister race muffler behind the magnaflow which acts like a resonator and quieted down the exhaust at part throttle to a very nice mellow tone. My piping is mandrel bent all the way from the manifolds to the tip. 2.5 inch to single 3 inch with an equal length y pipe. You will actually lose some part throttle response when you go to 3 inch (added that last) but I needed it for the supercharger.

 

[pronstar]

Duals with an X-pipe.
Gutted pre-cats, Magnaflow high-flow main cats.
Two tiny Magnaflow race mufflers.

Sounds killer from outside the truck, especially when you get on it.

But inside...entirely too loud, drones at many different rpm/throttle postions. I may have to add two resonators (muffler shop's suggestion) or get two less-annoying mufflers.

It's a penalty box for passengers.

 

[dubedition2003]

I am using Magnaflow Muffler with a stainless steel 4" tip, it sounds GREAT! its not too noticable on the inside but you can definatley hear it on the outside.

It's not too loud and it's not too soft. Sounds great when you are passing someone by on the highway.

I had to mine put in last month for some reason my 03' expy had a hole in the muffler and was rusting out, so while I took mine to a well known shop and a co-worker of mine knows the owner of the shop he gave me a deal on my muffler and even threw in the tip free of charge.

 

[03ddie]

I just had a 3" Flowmaster 70 installed with a 3.5" SS tip all on the stock 2.75" tubing. IT SOUNDS GREAT. I wanted a nice low rumble but something not too loud as it is the family SUV and this was the perfect match. $242 installed

Now I have been getting 22-24 mpg on the highway at 70 and before the best I ever got was 19(usually 17). I even saw it hit 26 for about 5 minutes with a mild tail wind.

I cant wait to see what the cold air intake that is on the way will do!

 

[green03]

Yep the best thing for these truck's efficiency is the stock pipe size with a better muffler.....

Have you checked your actual mileage vs what the computer is telling you? That just seems like an aweful big jump in economy...

Matt R

 

[03ddie]

No, I haven't had it on a full tank yet, but that wasnt average mileage, that was hitting the reset button when I was already at 70.

 

[RaiderNations]

Can you guys give me any recommendations on exhuast on my 07 XLT EL. Ive just ordered a cold air intake. Should be in this week. Next I want to upgrade the exhuast. Dont want to loud, but want performance. I want sizes and brand names so I can do some research. Thanks.

 

[TurboMatt]

No Gibson users here?

 

[pronstar]

Dump the collector / y-pipe (where the two pipes merge) and put an aftermarket one on.

From there, take your pick, I don't think there's a significant difference.

Personally, I like straight-thru designs like Magnaflow (and a few others) versus baffles that potentially could restrict flow (like FLowmaster and most others).

 

[IQ99]

If your 07 is the same as my 08(has to be) then replacing the Y pipe would be a waste as Ford did a great job. The bends are nice and free of kinks and the Y pipe itself has no restrictions in it or downsizing. I think a true dual may be all we can do besides dumping the stock can. I am intrigued by the huge cans that are put on just after the exhaust mans. They are massive resonators or at the very least look like it.Any ideas? RaiderNations what did you think when you looked at it? Or have you had time to look. It is crazy but Ford must want to kill the exhaust note or tune it. I can't hearthe exhaust anyway so it makes no difference to me. I will wait to see what you do exhaustwise and hopefully converse with you about your intake.

 

[IQ99]

Just another thought...the cats might be want I am seeing just after the exhaust mans. They may not be resonators. I just realized this last night.

 

[green03]

You more than likely have precats and cats on each side. The precats are usually smaller so they can light off faster.

Matt R

 

[IQ99]

Those things are big. I still have not had the time to really look around. I have not owned a Ford before many Nissans and Chevys but no Fords. I like the vehicle but she has a lot to pull and not much motor to do it with. Thanks for the info.

 

[AvroAero]

Originally posted by TurboMatt
No Gibson users here?

I have a Gibson swept side, along with Gibson stianless headers. I got them together and they did a good amount for peppyness. Only the exhaust gives a drone at 1700rpms. Sometimes its to much. I hate drone. Other than the drone its fairly quiet, until I'm on it with something beside the tail pipe otherwise I don't hear it over the cold air. I've only heard it from off a friends car once when he was on the passenger side when I was towing and it sounded nice.

This is on a 99 4.6

 

[XLTman]

I recently got a thrush turbo muffler welded on and i was really suprised how much my truck runs smoother and has a deep tone but not loud

 

[Remo]

Anyone every uses any Mac Performance products?

I know they have a lot of products for the F150/Expedition and their prices seem really low. I've heard they are pretty good quality, too. Just another option for you guys.

http://www.macperformance.com/

 

[IQ99]

They seem to have quite a bit of stuff but very little for an 07-08. I guess these are still pretty new in the eyes of the tuners.