Okay here it goes, i have a question about mufflers. I know its a personal prefenence but i would like to know everyones opinions on the subject. I am looking for the loudest and deepest sounding muffler out there. Price is not an issue. I've been told that the 30 series, single chamber kinda like a glass pack, muffler from flowmaster is suppost to be great, but i just dont know. So any input would be greatly appreciated. Thanks in advance.

Bryan

 

what engine are you running?? the nicest thing i've heard lately was some BORLA exhaust on a 4.6 mustang. real growly. loudest and baddest sound to get is true straight duals. been there, done that, just watch for the red & blue!!!!

 

Thanks, i forgot that much info. I have the 5.4 and i already have the exhaust run. Its true duals from the cats out. Its nice, but i want something deeper.

 

If you must have mufflers in your state, get a summit racing glasspack for 25$. To tell you the truth, you could run straight pipes, and it wouldn't attract that much attention, simply because the cats in these trucks dampen the sound so much. Straight pipes aren't that loud on these trucks, but if you need a muffler to pass inspection, just get a glasspack.

 

Yes, and no, i dont have to have one to pass inspection. I just want a deeper tone then what i have. I already hae just strait pipes.

 

lose the cats and go with a free flowing/high flow muffler. the cats are what cause the most performance restriction. however, lots say that no backpressure causes loss of torque. the muffler is what "tones" the truck... straight pipes have a sharper, louder crackle. i've totally(no cats or mufflers)straight-piped an '81 chevy 350, loved the sound, just couldn't live with myself for owning a chev...LOL did the same to my 96 f150 4.9L l6, but with glasspacks. it wasn't a v8 but it was ok for a l6. my vote is still this...--no cats!!! straight duals to "borla" mufflers...trust me on this one...

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2002 f150 s'crew 4.6L 67000m, no mods...yet
2001 yamaha yz250...nutz

 

OK, but what about the o2 sensors and the computer? I know they make an o2 eliminator but i just dont know about cutting my cats off. And around where i live it would be kinda hard to get it inspected without the cats. Now the muffler is a diff story, around here they dont really care, but the cats are a big thing.

 

Just remember even if the inspection folks let you slip past, the cops won't. They tend to notice things like an obnoxiously loud truck with no muffler.

 

If you decide to get rid of the cats, where abouts do you go to get o2 eliminators? Can you put 4 of them in for straight pipes?

 

Why do you want to do this? I would be very interested to hear your explanation.

 

in the case with my '96 f150, there were two O2 sensors, being a l6 i guess. one before the cats, one after the cats. i'm guessing that on the 8, its the same setup, just multiplied because of the V(someone correct me if i'm wrong ) what the muffler man had was a piece of pipe with the o2 stud/nut welded/manufactured into it allowing the o2 sensor to keep its orriginal position. there was a possibility that the cel may come on because the sensor may read different due to no cats, muffler guy says. i drove the truck for a month after the true duals, and no cel. i've since traded it for my '02...

guess thats just my experience...hope it helps

 

Well thanks again for your reply, but i dont really want to cut my cats off, im just looking for a really deep toned muffler. Thanks though, and if my truck was not so new, i would conside getting rid of the cats. Thanks again.

 

no prob...i still vote for the borla...lol

 

Yeah, if you dont mind the 200 bucks, for just one muffler. I will look around and see if i can find a sound clip to here what it sounds like. Thanks.

 

Since you knew it was coming... the reason why you shouldn't "lose" the cats in a stock engine:

4 stroke engines don't use back pressure for torque production. Back pressure is necessary in a 2 stroke engine only. Torque production in a 4 stroke engine is created by the speed of the air entering and exhaust exiting the head, not the amount (volume) of exhaust leaving the header/manifold. If you had back pressure your vehicle would never run right since it requires a vacuum in the exhaust system. By removing the cats and going to the factory 2 1/2" pipe, you slow the exhaust speed because you've opened the volume - you increase the cross sectional area. It's a physics property, as area increases, velocity drops -ever stick your finger over a running hose? Same principle, different fluid (exhaust is a fluid, btw). Why do you need exhaust velocity? Velocity of that exhaust when the cam lobes overlap is what draws in the air charge from the intake side, it creates a vacuum or scavenges the exhaust. Enlarge the most restrictive point in your exhaust and you lose part of your scavenging effect... you start to lose torque and it moves the torque curve higher in to your rpm bands.

Btw, your intake remains the same size, since we do not have any aftermarket intakes outside of Mustang 4.6s and supercharger manifolds - I'm talking stock here.

Having said that...

If you have an ulterior motive, say power adder or head work, then it makes sense to open it up... you'll have more flow coming in, and you need to balance that going out. I'm also not saying you need to keep you current cats... but maintaining the 2 1/4" ID is a pretty good idea. Don't restrict it by going to a 2" thinking it will give you more torque...it doesn't work quite that way. The intake and exhaust must be balanced to get the max effect and best performance.

If you need to remove 1 cat per side, then you need to remove the last one on each side. The first O2 sensor on each side is used to tell the engine how it's running so it can adjust the air/fuel mix accordingly. But for reasons of my personal well being I didn't say that ... EPA may be watching - and it's a Federal Offense (big fine and possible jail time) to mess with installed emissions equipment on vehicles equipped with smog systems.

-Kerry