Saying that exhaust won't do any good on our trucks isn't right. Our trucks are like a stuck pig from the factory. The muffler helps, trust me. Stock mufflers reduce sound the cheapest way there is - by restriction. Glasspacks are an absorbtion muffler, and flowmasters/other mufflers are a reflective type of muffler. Dynomax Race Bullets are a mix of absorbtion AND reflection.

My 302 5-speed saw .7mpg improvement in highway mileage @ 55mph after the muffler was hacked off and the exhaust left dumping under the bed. I guarentee it'll be a touch better after getting the rest of the pipes off and the duals on there. You are correct in that the dual exhaust cannot be completely taken advantage of unless the intake is similarly worked on. However, the intake of our vehicles is not necessarily a restriction. I will say, those of you with 4.6/5.4 motors, upgrading to a larger mm throttle body is one of the greatest improvements you can make for bolt on. So much better throttle response. My 302 has speed density and the twin-bore throttle body, so I can't - but you guys can =).

OH! And before you go buy that 80 dollar w/ installation muffler, give it a drive with the muffler removed and no muffler at all. Just try it.

 

I don't think anyone is saying 'no improvment with more open exhaust' Some of us are just saying that you don't get as much bang for the buck on this truck as on some other car/trucks
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At least on the 4.6. I don't know much about the 5.4. If it has the same muffler, then it would improve a lot more with back pressure reduced.

Also, a little rumble sounds great to us guys, but not to most ladies. And some of us care about that. I could have lived with the 18 Magnaflow. Loud. Great performance. But I would have been driveing by myself whenever I took the truck. Much better to loose a few horsepower. Besides, I can't tell any power difference between the 18'' and the 24'' catback. I can tell the differance from stock. Still not as much power gain as the Superchips for about the same money.

I do recommend lowering the backpressure on these trucks, even the 4.6. Just drive a hard bargain...

Chris.

 

From what I was saying above I should also mentioned that the exhaust system on the Bronco was severely restricted when I bought the truck. It had a single exhaust and worse yet someone had installed a cat with 1 7/8' dia inlet/outlet. The new system was 2 1/4" stainless pipes, new cats to match the pipe dia and steel ravin mufflers. This let the truck breathe...

No exhaust system is any bigger than the smallest ID of any pipe in it. Adding a dual cat back system doesn't open up anyones system.. If the cat is 3" and you add six 4" pipes to your rear bumper you still have a 3" exhaust system. The only thing that will help is reducing the muffler restriction, but on the flip side these new high tech engines are designed with to live with a certain amount of back pressure restriction. Without it, with a too open exhaust you'll loose the most valuable part of the new 5.4's design and that's it's low end guts.(torque)

You want more sound? The truck sounds like a sewing machine?? The question is finding an exhaust system that sounds right and still maintains enough back pressure so the engines will run right........

Do any of these exhaust system's really give you any more power "or" mpg...??

Until I see real numbers on mpg I don't see the point of scerwing with the exhaust systems on these trucks.

I'd really like to see/hear somer comments about the Gibson Super Truck System. It's a simple bolt on with dual pipes that exit in front of the rear wheel... 400 bucks Alum... and I haven't been able to find out what the stainless version costs.

 

Hey guys,
Well after wasting little time deciding what to do, I had my stock muffler cut off(barely fit it in my bed, ha ha) and put on a 40 original series flowmaster. by the way it is 2.5 in and 2.5 out. the shop had to add a small piece of pipe to tie it in to the stock pipes. $60 for the muffler at A&A auto and another $47 for the install. Satisfied with the price. Then went down to Auto Zone and grabbed a K&N filter for $40 and threw it in. The initial start up was noticeable but not quite what I thought. After making a couple of trips up and down an expressway near by picking up furniture I became very happy. Seems the more I drive the louder the rumble. Now I am very happy with this. I think I was hoping for the same sound of my father-in-laws 04 Mustang GT with Full intake system and full dual exhaust. He was with me when picking up the furniture and he too noticed the change in very little time and said I am giving him a run on the sound. Seems like I picked up some power and havent put on enough miles yet to get mileage. I would highly recommend going this route especially if you are on a budget. Next up is the superchips which should be around for Christmas.

One question, did I read somewhere that the flows actually have somewhat of a break in time, where they will actually get even louder, that would be just AWESOME!!!!

 

I've got a 3.0 L ranger and am wanting to do duels out the back, looking for a muffler recommendation to accompany this. I've got the place that I"m gonna get the job done at down, had a couple friends take a camaro and a colorado up there and they did an excellent job to those. Did it for about 140. Just looking to price mufflers now and seeing what someone would recommend for my ranger.

 

i have started liking mine more and more and its only been 5 days. I think it a little louder but im not sure if thats me liking the sound more or if its really getting louder. I somehow doubt its really getting louder though.

 

It's getting louder. They do get a little louder after some use. 800 miles on my exhaust and it's noticably groweling. Works for me.
Chris

 

can someone explain the reasoning behind why it gets louder to me?

 

I have an 00 ranger with the 3.0 and I did a custom exhaust on it. I didnt do the dual out the back cuz its a small six and I had never heard one that had done that that sounded good! What I did was put a single glass pack on and upgraded to 3" pipe and kicked it out in front of the rear wheel. The glass pack is around 8-10" long, I think they called it a bullit glass pack. Whatever it is it sounds great. Its pretty loud for a six (actually louder than a friends f-150 v6 with duals). Sounds good at idle, really good cruisin round town, little loud on the highway but still has a good sound (I havent gone with the k&n yet or any other proformance mods). Pipe from the cat back and the glass pack and labor cost me just over a hundred. Just thought I would let you know, hope you like whatever you go with.

 

hey truck,
can you pm me with instructions on pulling off the factory intake tube, also can anything get wet by doing this. thanks for the help