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post #1 of 23 (permalink) Old 09-30-2007, 10:30 PM Thread Starter
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Exhaust questions

I am wanting to change my exhaust but I am not looking to go to wild. I want something that has good sound but is a better perfoming exhaust. I have heard that true duals will lose tourqe. My idea right now is to cut the 3rd cat out and replace with a Y pipe, delete resonnator and put a Dynomax cat back kit on. The motor is stock now but I plan in the future for a Blue oval tune with a Mustang airbox and 80mm MAF. Has anybody done a setup like this. I just need some opinions from yall.

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post #2 of 23 (permalink) Old 09-30-2007, 10:41 PM
 
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True duals can only lose torque if you go too big, at least that is my understanding. I would recommend the magnaflow di/do, and 2.25" duals. The muffler has a built in x pipe, and a straight through design. I have 2.5" on mine, and I don't have any mods done, yet, and I didn't notice a loss in torque, but I would say go with 2.25 just to be safe. The muffler has a great sound, but only gets really loud when you're in the hard on the gas
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post #3 of 23 (permalink) Old 10-03-2007, 09:09 PM Thread Starter
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any other opinions?
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post #4 of 23 (permalink) Old 10-04-2007, 01:08 PM
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I gotta go with 94.

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post #5 of 23 (permalink) Old 10-05-2007, 11:19 AM Thread Starter
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I see, Thanx. One more question. Will this setup with the duals be around the same price?
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post #6 of 23 (permalink) Old 10-05-2007, 11:39 AM
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That really depends on who's doing it. Definately shop around because the sky is the limit.

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post #7 of 23 (permalink) Old 10-05-2007, 12:01 PM
 
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i got my pipes done for 150, but I agree with drnaline, have to shop around, and take pictures when you go, cause a lot of places say it can't be done
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post #8 of 23 (permalink) Old 10-05-2007, 02:56 PM
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i onwed a shop in mississippi and worked at one in balitmore before i moved to memphis. usuall cost for a custom true dual out the back set up without mandrel bends was right around 550 with bullet mufflers from dynomax (similar to a glass pack but uses cermaic packing for longer life and a better more refined muscle car sound). most of the guys on this board i've seen have gone this route and are happy as clams. they sound amazing.

like the others said shop around, a reputable shop that will stand by there work is most necessary. alot of "custom exhaust shops" have mechanics who can't weld if their lives depended on it.

now, with that said, either 2.25 inch pipes or 2.5 inch pipe will be fine with the mods you have planned. with respect to torque its not neccesarily that you lose any, its that the rpm band is shoved up (u make power higher in the rpm band). Horsepower itself is a mathmatical function of torque. to me is more about advertising than it is about what the car can do. just my opinion though. my point is that as with any performance modification, you gotta choose whats gonna fit with ur current set up. those two pipe sizes will work the difference is very slim, 2.5 inch is what i usually go with for v8 applications as it has more wiggle room for future mods.

the set up you explained with the dynomax catback is also a good one which will add some power and sound, but as for the sound the dynomax cb uses its turbo mufflers which are quiet, nearly stock quiet. if ur interested in another suggestion for a catback like that send me an email, [email protected] or hit me up on aim at the same screen name. id be glad to talk with you and help you out with any questions you might have or advice.
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post #9 of 23 (permalink) Old 10-05-2007, 03:43 PM
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Yup, it should look good as well as sound good. Every thing should be symetrical in relation to itself. I don't like clamp together anything and alot of systems you buy out there a clamp on. You could always ask for examples of there work, but i would mandate welding as a minimum.

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post #10 of 23 (permalink) Old 10-05-2007, 08:44 PM
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I run true duals 2.25" with x pipe/dynomax bullet mufflers/graduation into 2.5" right at the differential. The sound is good. Had a magnaflow dual in dual out with built in X-pipe previously, but it was way to mellow of a sound. Not bad sounding, but definatly not aggressive AT ALL. Then i went ahead and went with the dynomax bullets, and these i have been more happy with. Not raspy, but a more aggressive sound for sure...

However, i'm going to change it over to a big single. In my opinion true duals for these cars require too many bends (especially if the bends are crush bent) to be efficient. With a big single pipe going around the gas tank, one can lessen the severity of the bends. Also running a single pipe would be cheaper if your that concerned about price. (1 pipe to be bent, 1 muffler, etc.) The price would probably be almost cut in half.

Now for flow... These cars don't require much flow, as we have a hair more than 200 horsepower, and only 281 cubic inches of displacement. Plus as i have said before, true duals require so many bends that there is no way that thing can keep a good velocity (good for torque) with that many crush bends. Horsepower i'm sure is effected as well. Because again... the amount of bends. A pipe measuring 2.25" across is going to become significantly less after it's bent with a compression bender. Also think about it like this... There are loads of import cars running single 3" pipe or 3.5" pipe, etc. Obviously less displacement and less cylinders, but if a 3 or 3.5" can support a 300HP STI, EVO, Supra, or the like, then i'm sure it can support a 200HP V8... Just my opinion and something to think about. Good luck.
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post #11 of 23 (permalink) Old 10-07-2007, 04:39 PM
 
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I disagree with the magnaflow lacking an agressive sound, although it isn't loud at idle, and doesnt get very loud till about 2200 rpm, but it depends on what sound you like, too. I went to it after having flowmaster super 40's, which had very little "good, agressive" sound, so the magnaflow was a HUGE improvement. I guess I would have to hear the bullets in person, to make a decision. I'm definitely happy with the magnaflow though
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post #12 of 23 (permalink) Old 10-07-2007, 10:00 PM
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Well part of having an aggressive exhaust note is the note at idle and cruising speed. Aggressive isn't necessarily loudness, but it has that special something that lets you know it's not a Suburban with a cat back on it. When i had the magnaflow DI DO it didn't sound much different than a truck with a generic muffler welded in place of the stock system. That was my biggest complaint about the magnaflows. Just too mellow sounding and lacked that modern muscle sound. In my opinion it sounded very close to a small Japanese V8 such as a Lexus 4.3, rather than sounding like an American thumper.

Magnaflows are no doubt a good muffler, and probably a good starting point for most people as their not too loud, not droney, not raspy, and seem to last a long time (have good quality). But i think if one is looking for something very aggressive and beastly sounding i would look elsewhere.
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post #13 of 23 (permalink) Old 10-08-2007, 04:14 PM
 
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I don't know what your system sounded like, but mine doesn't sound like a lexus. I think it sounds more like a gt, not a really loud gt, but that sort of sound. Of course, this is all left to personal experience/personal preference, but mine sounds quite agressive, just not at idle. At idle, it sounds more like a stock gt, fairly quiet.
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post #14 of 23 (permalink) Old 10-08-2007, 05:03 PM
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I've got 2.5" true dual on my 96 with high flow cats and mid-mount Magnaflow. I like the setup, but wish it was just a touch louder. But for a daily driver it sounds great. I went with the 2.5" because my original plan was to put a Vortech on it. If I wasn't going SC'ed, I'd go with 2.25.

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post #15 of 23 (permalink) Old 10-08-2007, 08:50 PM
 
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I agree, and my eventual plans include some sort of blower...
but for now, while im in college, its a daily driver, and im happy with the way it turned out, though i could stand it a bit louder. I have also heard that the 2.5 gives it a little deeper sound... no proof to that, its just what ive heard
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post #16 of 23 (permalink) Old 11-02-2007, 11:22 AM
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I have recently had true duals ran on my 1996 3.8 n/a. It sounds okay. I went with 2 inch all the way back.

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post #17 of 23 (permalink) Old 11-02-2007, 01:37 PM
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a good cheap way to do it is 3" single cat back then a crossflow (camaro style) magnaflow at the rear (dual outlets). that makes it so much cheaper buying one muffler and a single exhaust. It also sounds more aggressive than the di/do everyone is running.

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post #18 of 23 (permalink) Old 11-02-2007, 04:00 PM
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True duals will not lose torque. Actually duals with an X-pipe increases torque, while an H-pipe increases high-end. Since the common method of doing true duals is to use the mid-mounted magnaflow, which has an X pipe built into it, the true duals will actually increase your torque, assuming you don't go too big.

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post #19 of 23 (permalink) Old 11-02-2007, 04:22 PM
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Quote:
Originally Posted by MadMikeyL View Post
True duals will not lose torque. Actually duals with an X-pipe increases torque, while an H-pipe increases high-end. Since the common method of doing true duals is to use the mid-mounted magnaflow, which has an X pipe built into it, the true duals will actually increase your torque, assuming you don't go too big.
actually thats backwards tests shown that a h pipe helps the lower end and a x pipe helps the upper range.

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post #20 of 23 (permalink) Old 11-02-2007, 04:46 PM
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post #21 of 23 (permalink) Old 11-02-2007, 06:59 PM
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I just cut off the middle resonator and hooked up a flowmaster, mid mount and it sounds great.
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post #22 of 23 (permalink) Old 11-06-2007, 12:07 AM
 
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Do what I did.

Dual piping 2.25 inch. All the way back to two glasspacks in the rear.

Sounds really good and not that loud, until I open the cutouts
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post #23 of 23 (permalink) Old 11-06-2007, 03:18 AM
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or you can do what i did, put a magnaflow cat where the resonator was (only cat on the car) then just hack the muffler off and leave it. It sounds pretty good w/ a 351, not sure about a 4.6. It's kind of redneckish, but i am from southern missouri, lol. some of the guys at the KC meet couple weeks ago heard it and liked it.

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Red Green, is that you? Might consider looking into fabbing an intake setup that isn't so, well, ghetto.
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