Let me know what magnaflow you get! Im looking for a exhaust that isnt that loud also!

 

The only mpg increase with exhaust you would ever see is with true duals. They suck for low end power but damn if they don't perform great WOT and get good mileage highway with how free breathing the engine can perform. A single exhaust is just as sufficient enough with a performance based muffler.

He does, offset both ends is the best fit for a direct swap.

x2. Chevy Malibu and Ford Fusion are great on fuel annually and have great features.

 

I had an '07.5 STX SCab with a 4.6L - 2V engine (248 hp) with auto trans., 3.55 gears and stock size tires on stock alloy wheels. I usually averaged 17.9 mpg in combined driving and 21 mpg on the highway with cruise set at 70 mph. I always ran Shell or Conoco 87 octane gas.

My truck had the following mods:

1. Extang Black Max Tonneau cover
2. 3" Magnaflow Catback with a 22" muffler (loud when I wanted to hear it and tame at cruise)
3. AFE CAI (for sale)
4. SuperChips Flashpaq programmer (87 tune)
5. Lund hood deflector
6. Ford mud guards

 

Hey fellas,

Don't want to thread jack at all but since we're on the topic already......

I'm thinking about swapping an oval 18 or 22 inch Magnaflow into my 2010 5.4 screw.

Just curious if anybody knows what offsets I should order for the best fit?

 

^ A shop can bend anything to get it to fit. Crawl under there and look to see what you think would fit with the fewest bends.

 

hey mickey i will post it on this thread which muffler i go with and how it sounds. im really leaning towards the 24 inch magnaflow. on the 08 it looks like a center inlet and offset outlet would work.

 

darren ws6,
question: if you put true duals on the truck would you not need a coustum tune? i know on some other vehicle manufactors if you change out exhaust to run true duals it would set off a knock sensor... just courius.

 

I have a 14" Magnaflow si/do on my 2002 4.6 has a nice rumble not to loud. I take 10 trips a few times a year with the wife she never even mentions it. Looking at now switching it to a Borla Pro Xs thanks to Avfrog and Migdaddy...

 

really a 14". i figured that would be fairly loud. is it a split system, single out, or a turn down? im wanting to do a turn down for the nice clean look. besides everyone around these parts has dual exhaust and i want to be different. i would settle for a single in single out in the factory location exhasut system but like i say around this area a turn down would have poeple asking me what ive done to this truck

 

No it will not require a tune as exhaust is mechanical, not tune-able. Only tuning work involved is turning off the rear O2s on cat-deleted vehicles. I had no problems at all besides the fact that low end torque sucked after wards.

 

how much does high flow cats actually help hp and mpg? ive read a few threads on here that it really wakes up the power but have also heard that it helps mpg alot.

 

I'm not trying to start a big debate or partially hi-jack this thread in an attempt to go a different route. If you lose low end torque after an exhaust mod., you need a tune to compensate for the change.

I know, I've read the huge thread on exhausts. It is a very thought out write-up. If you lose bottom end torque after an exhaust mod., you need a tune (air/fuel & spark) to compensate for the difference. It is the same for carbureted or FI vehicles. A carbureted vehicle requires a jet and nozzle swap, sometimes timing/plug gap adjustment and an FI vehicle requires a modified (programmer, laptop) tune.

Just my input after numerous carbureted and FI vehicles in the past 29 years of driving and working on vehicles & aircraft.

OP, keep us informed on the muffler you install.

James

 

im kinda in the same boat, lookin to go the cheapest route. between either the borla xs or the flowmaster 40 delta on wickednickys, leaning towards the borla. want to just dump it just like drt rider cuz i hate the look tips too but i know itll kill the sound, might take the pipes over the axle and just dump em there.

 

Mine is a si/do.. 2 1/2 out with tips 45 degrees out the back. It has a rumble, but at cruising 70-75 it's not that loud at all.. believe me, if it bothered her, i would know by now..lol..

 

You loose torque because of the loss of spent gas velocity, but a custom tune does help some.