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I searched the exhaust forum but didn't find any really good info. for a muffler for the following setup:
350ci with HX55 turbo
3" dual exhaust
I am looking for QUIET mufflers that flow well. I would like to have next to zero backpressure in the exhaust. So far the best I found was the Dynomax Ultra Flow 3" In / 3" out. They ad seems like they will be loud. Is there are a muffler out there with near stock sound that flows over 600 cfm?
two 3 inch dynomax ultra flow mufflers
Straight threw design, cheap and very quite
I ran dual 3 inch into one 4" ultra flow muffler it was cool but was just to quite, my friends couldn't even tell when I was downshiufting on the freeway next to me. I was just gone with no noise. I know run a 4" dynomax bullet still not obnoxious but has a little bark to it.
two turbos
stock bottom end low boost
first pass 11.7@128 next pass broken 9 bolt axle
Last edited by superirocz; 11-09-2006 at 09:01 PM.
Thank you. The Dynomax Ultra Flow sounds perfect for what I want. I plan on running dual 3" mufflers. The quiet part is what I want. The flow numbers are excellent on their website. I have two Flowmaster 40s on it now that came with the car and I dislike them. The two T3 units on it help but it is still too loud.
I need to fab new exhaust for the HX55 going on it this winter. I have the 3" u-bends sitting in a box and just need the mufflers. Dynomax ultra flow 3" would fit great under the car.
Another vote for the Ultraflow. I haven't had one but lots of my friends have on various cars, they always seem to sound mellow and quality, not loud or annoying.
I think I changed my mind. All of the data I have seen so far show that the Hooker Max Flows are quieter than the Dynomax Ultra-Flo mufflers. The CFM ratings are about the same. I like the Hooker mufflers better because the results I saw show the Hooker mufflers to be quieter at idle and part throttle. I hope the data I saw is correct.
not to get off topic, but... junkcltr did you ever run your car at the track?
back on topic, it really depends on your definition of quiet, you could probably make it really quiet by running 2 or 3 glasspacks before the 'real' muffler, they are straight through and won't restrict it at all, just add weight.
Edit: if you go with the holset would you consider parting with the t3's? PM me.
Off topic is fine. Usually good stuff comes from it. I ran it once a while ago. The setup was stock suspension, 275x60x15s street tires ($70 each) at 26 PSI. Ambient temp was 60* F. 93 octane, no IC, no water/alky spray, 6.5 PSI of boost, IAT at boost was 150* F. Both runs were 13.1 ET 1/4 mile at 106 MPH. Both 60' times were 2.3 seconds. Launched at 1400 RPM and rolled into the throttle with slight tire spin. Full throttle by the time I hit second. Tires blazed when it shifted into second. I had to let off in third due to the 4:10 gears and engine RPM.
I am keeping the T3s for another project that I will eventually get to. I am not sure how well the HX55 is going to fit with the internal wastegate housing in the car. This thing is really long with the 5" down tube on it. I guess I will figure it out when I get to it. A custom inner fender well will probably need to be fabbed.
I want quiet like a stock v8 Chevy pickup. I know that won't happen, but that is what I would like. I guess I have to call Hooker Headers and find out the real CFM for the Maximum Flow mufflers. Web data claims they are in the 1100 CFM range and Summit Racing claims 600 CFM. The Dynomax website says the ultra-flo is good for 1100 CFM. If the Hooker Max. Flows only do 600 CFM and sound almost the same then I will go with the Dynomax units.
I called Hooker Headers and gave them the part number for the muffler. They said they don't make that part. I said it was a muffler, then they found it. They said that the muffler was designed in 1998 and do not have any data for the MaxFlows, but they have data for the AeroChambers.
I have always liked the Hooker exhaust parts but I guess they don't really test their mufflers like they should. I called Dynomax and they gave me all the info I asked for. Based on a good product, a desire to test their products, and a tech line that is actually helpful..........I am going with the 3" Dynomax Ultra-Flow Welded models.
I finally got around to loading flashplayer 8 so I could download the Dynomax (Walker) catalog. It has all the dimensions and flow numbers. It also lists the sound in terms of street, sport, race.
I am going to order a set of the super turbo P/N 17769 (duals flow for 500HP @ 2.2 CFM per HP). They are supposed to have a street sound. I need them for the truck since the exhaust is starting to crumble. If they truly sound like street mufflers then I will order some Ultra-Flow P/N 17221 for the turbo car. They will flow for 1000+ HP and have a sport sound (supposedly).
my bad, i replied over at TM.com, just deciding which way we're going with the car. he still has the internal gates, if he was willing to sell them then it might be cheaper for me that way.
what about the pics?
my bad, i replied over at TM.com, just deciding which way we're going with the car. he still has the internal gates, if he was willing to sell them then it might be cheaper for me that way.
what about the pics?
I remeber reading somewhere once where a diesel mufflers were used on a project. I havent researched it myself but I would think they would meet the flow requirements you seek, would probaly be dead silent. Only drawback would be size maybe. Sounds silly, but you never know.
I did look around at diesel mufflers but the physical size was too big. I finally made up my mind and ordered a set of ultra-flows. They are way more than I need so I shouldn't have to worry about upgrading later on. I am going to try them on the truck that is N/A first and see how they sound.
I am putting 3.08 gears in the car so I can drive it more often on the highway and would like it quiet and more streetable.
I fabbed some dual 3" exhaust for the N/A truck with dual 3" Dynomax ultra-flos to see how they sounded. The truck needed exhaust so I figured it was a good time to try the mufflers. They have a bark in N/A form. Much louder than I was hoping for. The car with two T3s, dual 2.5" pipes and flowmasters is WAY quieter.
junkcltr - Where did you see the sound level comparisons? I'm looking to quiet down tht Z28tt a bit as well (open boom tubes out the side, sounds great, but a bit loud for Sunday mornings in my neighborhood - sound levels at http://www.skulte.com/z28tt/archives...d_testing.html, 95 dBa inside at 5000 rpms in neutral, with the wastegates closed, outside 50' to the side it's 75 dBa idle and 92.5 dBa at 5000).
Part of the noise could also be the open wastegate dump pipes - I may have to look into bringing them into the downpipes as soon as I up the size from the small 2.5" dual downpipes currently on the Z28tt.
I called Dynomax, and according to them, the bullet race mufflers lower the dB by 2-4, while the Ultraflow Welded and Ultraflow SS lower it from 10-12 on the short ones and 12-17dB on the 20" long mufflers. Since muffling depends on the length, dual 3" exhaust with their own mufflers will be quieter than a single 4" exhaust. I followed up by browsing through their catalog. Their 3" in/out Ultra Flow Welded Universal Mufflers all flow 1800 cfm @ 20.3" of water for the straight through (center-center or left-left inlet-outlet) mufflers, which they estimate is good for 818 loss-free horsepower. Changing to a center-left knocks it down to 1300cfm/591hp and a left-right gets it to 1100/500. Their 3-1/2" center muffler is good for 2200 cfm/1000 hp, but I wonder how well it muffles. These are all 4-1/2" x 9-3/4" oval mufflers.
Spoke to Magnaflow, and the tech recommended their 12469 5x8" ovalized 3" dual x-pipe muffler, that's 18" long, which has a roughly 6" cross section in the middle of the x-pipe (http://www.magnaflow.com/02product/s...e=main&id=476). I wasn't able to get any flow numbers or estimates of how well it quiets things down. They also have 4x9" oval mufflers for more ground clearance, and a 5x11" (pn 12599) dual in/out oval as well.
Bullet type mufflers - flow great, but barely muffle
Borla XS - quiet from the tests, but no 3" or larger...
Flowmaster - Terrible flow
Hooker Aerochamber - quietest, higher backpressure
Dynomax Ultraflow - straight through, decent quieting
DNA - Direct Natural Airflow - Race muffler - loud, flows great
Magnaflow - great flowing, quiet, very low backpressure (http://www.turbomustangs.com/smf/index.php?topic=63459)
Hooker Max Flo - quiet at idle, loud at WOT.
After reading dozens of threads this morning, speaking to tech support, and thinking things over, it seems like the choices are narrowed down to the Dynomax Ultra Flow, Magnaflow Universal, or Hooker Max Flow. Time to measure under the car to see what needs to fit.
I haven't picked them up yet, but I'm hoping you like the Ultra Flow's with the turbos. I plan on mounting the mufflers on either side of the T56.
Compared to the dual 2.25" with $15 turbo mufflers (rotted hole in one of them).....this thing is slightly louder at idle and low throttle. Under a load like leaving the driveway onto a main road I have to take off at sub-Grandma speeds to keep it from barking loud. So during accel and WOT this thing is LOUD. It has Hedman headers, 218* cam, TPI. Nothing fancy for an engine.
The exhaust is 3" duals with the 17221 Ulta-flows good for 1300 CFM a piece. I wish I had a Decibel reader and I would post the numbers. I wonder if any local shops would have one? In terms of loudness, idle isn't bad, low RPM cruise is OK. Normal Accel to hard accel is too loud. WOT is unbelievably loud.
I am saving gas now though that I take off at sub-Grandma speeds to keep the noise down. It is also motivating me to get the single turbo on it quickly. These mufflers are slightly louder than the car with two T3's and Flowmaster 40s at idle and cruise. They seem twice as loud at WOT and hard accel. I would never recommend these mufflers in terms of a N/A vehicle muffler.......but I don't like loud stuff anymore.
EDIT: I do plan to use these on the turbo car when I re-make the exhaust this winter. Judging from how much the dual 2.5" Flowmaster 40 mufflers quieted down with the T3s, the Dynomax should be even quieter. I am OK with this, but the U-Flo's are too loud for me on an N/A engine. Good for a street "racecar" in N/A form but not a daily driver.
