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Old 09-17-2011, 09:54 AM   #1
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muffler recommendations

Hey all,

My stock muffler finally rusted out on my 97 sport up here in NYS. Since I have to put a new one on anyways I want to spend a bit more and put something on that will sound better than stock. I want a muffler that will make the 4.0 sound deeper and more aggressive, but not something that is obnoxiously loud. Basically I want it to sound like it should- mean but not loud enough where it'd be annoying to drive around/ wake people up early in the morning. I've heard that the flowmaster 40 or 44 would be a good choice, any suggestions? Also what is the inlet/outlet offset? Is it 2.25 for both?

thanks

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Old 09-17-2011, 09:57 AM   #2
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Ohh I forgot to ask, is it worth it to bring it to a shop and have them weld it up or is the whole sawing/clamping routine in the driveway worth looking into?

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Old 09-17-2011, 10:01 AM   #3
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Flowmaster 50 is nice. Just the right amount of noise without being annoying. My 2000 TJ had a center inlet of 2.25 and a offset outlet of 2.5, but I bought the whole Cat back system.
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Old 09-17-2011, 10:06 AM   #4
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If you want any performance gain at all, avoid Flowmaster.
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Old 09-17-2011, 10:33 AM   #5
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He never said anything about a gain. The flowmaster 50 is a good choice
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Old 09-17-2011, 10:43 AM   #6
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I recently swapped out the flowmaster for an mbrp cat back set up. I think it sounds great. And no cutting or welding required.
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Old 09-17-2011, 11:00 AM   #7
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I have a Borla exhaust and think it sounds a lot better than stock, not loud at all just deep. Might sound different on 4.0.
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Old 09-17-2011, 11:03 AM   #8
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Yeah Im not looking for any performance gain, I just want a cleaner/meaner sound. The Flowmaster 50 is an option, but Im also a student that doesnt have a ton of money laying around. The Flowmaster 40 is the cheapest, but realistically how loud is it?


Today 11:06 AM
DoubleTap "If you want any performance gain at all, avoid Flowmaster."

---It won't cause a decrease in performance will it?

I've got a 188,000 miles and it still runs fantastic.
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Old 09-17-2011, 11:10 AM   #9
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There is a recent post on the tire section of this forum regarding mileage improvement after installing a flowmaster 40 after upgrading to larger tires. I just went with some MT MTZ tires and my mileage dropped a little, so if I could gain a little performance and mileage improvement, I'd be interested in installing a new exhaust system. How noisy are catback exhausts over stock?


Quote:
Originally Posted by lucky4075 View Post
Yeah Im not looking for any performance gain, I just want a cleaner/meaner sound. The Flowmaster 50 is an option, but Im also a student that doesnt have a ton of money laying around. The Flowmaster 40 is the cheapest, but realistically how loud is it?


Today 11:06 AM
DoubleTap "If you want any performance gain at all, avoid Flowmaster."

---It won't cause a decrease in performance will it?

I've got a 188,000 miles and it still runs fantastic.
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Old 09-17-2011, 11:42 AM   #10
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Heres a video where you can here my flomaster 40series 2 chamber.
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Old 09-17-2011, 11:43 AM   #11
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I'm looking more at the flowmaster 44 now, its gotten good reviews on Jeeps and seems to have the right balance between volume and deepness in sound.
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Old 09-17-2011, 11:59 AM   #12
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I just put a super 44 on my jeep yesterday and love it. Sounds good and its not really noticeable on the hi way even going 70, its a center inlet and offset outlet. I does have a good sound at idle alot better then the look alike cherry bomb that I took off and my converter is gutted
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Old 09-17-2011, 12:19 PM   #13
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My 97 TJ was built for the Canadian market. A cat and a resonator, no Muffler stock. Still run it that way. Sounds nice and I don't have to worry about the Rice Rocket sound. Really sounds nice with the new exhaust manifold without the quarter size crack in it. Much better back pressure.
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Old 09-17-2011, 01:24 PM   #14
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mufflers are for little girls. (jk lol)

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Old 09-17-2011, 01:34 PM   #15
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Quote:
Originally Posted by TJWenatchee View Post
My 97 TJ was built for the Canadian market. A cat and a resonator, no Muffler stock. Still run it that way. Sounds nice and I don't have to worry about the Rice Rocket sound. Really sounds nice with the new exhaust manifold without the quarter size crack in it. Much better back pressure.
Um, I'm sorry to disappoint you but the Canadian Built TJ's came from the factory with a cat and a muffler, no resonator. So whatever you have under your jeep either somebody made it that way or you are mistaking what you think is a resonator is an actual muffler.
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Old 09-17-2011, 01:37 PM   #16
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As for the muffler, I would get a Magnaflow, I found that Flowmasters quality has gone down the tubes in the last 5 or so years, they tend to rot from the inside out, from what I've seen.
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Old 09-17-2011, 03:16 PM   #17
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Quote:
Originally Posted by lucky4075 View Post

---It won't cause a decrease in performance will it?

I've got a 188,000 miles and it still runs fantastic.
Maybe, maybe not. Flowmaster uses baffles and chambers to get their sound/tone, the exhaust gases basically bottleneck and force their way through a Flowmaster muffler. They sound good, but are horrible for performance.

A straight-through design muffler such a Magnaflow or Borla will perform better than a Flowmaster. Lets face it, these are low HP/TQ Jeep engines, they need all the help they can get and certainly don't need something decreasing power.
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Old 09-17-2011, 06:13 PM   #18
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I see what your saying, but if a system is too free flowing it can lower power/torque as well. If I keep the rest of the exhaust system stock except for the new muffler, will it cause any real/noticeable loss? I would think that keeping everything else stock and putting a slightly better flowing muffler would be pretty neutral overall as far as power/torque.

Also does anybody know the specs on the in/out diameters? Its a stock 97 sport with 4.0
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Old 09-17-2011, 06:13 PM   #19
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I see what your saying, but if a system is too free flowing it can lower power/torque as well. If I keep the rest of the exhaust system stock except for the new muffler, will it cause any real/noticeable loss? I would think that keeping everything else stock and putting a slightly better flowing muffler would be pretty neutral overall as far as power/torque.

Also does anybody know the specs on the in/out diameters? Its a stock 97 sport with 4.0- is it 2.25/2.25 or 2.5 on both ends?
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Old 09-17-2011, 07:09 PM   #20
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i used to have a flowmaster super 40. sounded like a damn ricer....so i got tired of the sound and went with Banks Monster exhaust. It sounds great. gives it a deep, aggressive sound with no drone. waaay better than flowmaster.
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Old 09-17-2011, 11:23 PM   #21
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Quote:
Originally Posted by jeepjones View Post
Um, I'm sorry to disappoint you but the Canadian Built TJ's came from the factory with a cat and a muffler, no resonator. So whatever you have under your jeep either somebody made it that way or you are mistaking what you think is a resonator is an actual muffler.
Sorry JeepJones, my bad on part of comment. Service manual for 97 TJ (Canada only page) shows muffler and Resonator. Mine is stamped resonator with part number and the word Canada on it. May make a difference that my TJ was made in the U.S and imported into Canada (Alberta to be exact). Someone did take off the muffler though. Don't mean to argue, all Jeeps have their quirks and alas this must be another one. Really doesn't matter as I will have to replace resonator soon, has quite a few pinholes in it. Anxious to see what other recommend since I seem to be in the market for a muffler soon as well.
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Old 09-18-2011, 10:16 AM   #22
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Quote:
Originally Posted by lucky4075 View Post
I see what your saying, but if a system is too free flowing it can lower power/torque as well. If I keep the rest of the exhaust system stock except for the new muffler, will it cause any real/noticeable loss? I would think that keeping everything else stock and putting a slightly better flowing muffler would be pretty neutral overall as far as power/torque.
There seems to be a big misconception about exhaust systems on this forum... In an exhaust system, you want as high of an exhaust gas velocity as possible and as little back pressure as possible.

A simple muffler swap to a free flowing, straight-through muffler will not produce a system that is "too free flowing". LOL. A single 4" exhaust system (exaggeration) would be too free flowing for the small 6 and lower exhaust gas velocities considerably; along with performance.

I just don't see the point in spending hard-earned dollars for ZERO gain in performance, just noise...
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Old 09-18-2011, 10:19 AM   #23
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Quote:
Originally Posted by DoubleTap View Post
There seems to be a big misconception about exhaust systems on this forum... In an exhaust system, you want as high of an exhaust gas velocity as possible and as little back pressure as possible.

A simple muffler swap to a free flowing, straight-through muffler will not produce a system that is "too free flowing". LOL. A single 4" exhaust system (exaggeration) would be too free flowing for the small 6 and lower exhaust gas velocities considerably; along with performance.

I just don't see the point in spending hard-earned dollars for ZERO gain in performance, just noise...


More than you ever wanted to know about BACKPRESSURE... - Third Generation F-Body Message Boards this is a great thread on backpressure
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Old 09-18-2011, 10:24 AM   #24
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Yes it is! Many should read it!
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Old 09-18-2011, 10:38 AM   #25
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Yes it is! Many should read it!
i love the line in that thread - "I don't want to hear any more bull about backpressure bringing the world to an end, or it causing cancer. The term you are looking for is "tuned resonance"
when dealing with pressure pulses" lol

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