Quiet High flow mufflers

[vkirkend]

I'm looking to complete my 2 1/2" exhaust on the original "Impala Slayer" and am looking for mufflers that flow but sound closest to the OEM mufflers (Low noise level) and are stainless. Any suggestions?:dunno:

[SC Cheesehead]

I'm looking to complete my 2 1/2" exhaust on the original "Impala Slayer" and am looking for mufflers that flow but sound closest to the OEM mufflers (Low noise level) and are stainless. Any suggestions?:dunno:

I think some of the Magnaflows are pretty quiet, Vernon, but don't know which series. Hopefully someone else will chime in.

What, you don't like the Aero Turbines? ;) -----> :D

(When Dave gave me a ride in the car up to the Philly airport, it was so loud it was hard to hold a conversation at speed, so I know exactly what you're talking about.)

[vkirkend]

I think some of the Magnaflows are pretty quiet, Vernon, but don't know which series. Hopefully someone else will chime in.

What, you don't like the Aero Turbines? ;) -----> :D

(When Dave gave me a ride in the car up to the Philly airport, it was so loud it was hard to hold a conversation at speed, so I know exactly what you're talking about.)

Ahhhhhhhhhhhhhh NO!!!!!!!:burnout:

What do you have???

[SC Cheesehead]

Ahhhhhhhhhhhhhh NO!!!!!!!:burnout:

What do you have???


I'm actually still running the OEM mufflers.

Shorty headers, a set of high flow cats into a Mac Pro-Chamber mid pipe feeding into stock exhaust from the mufflers on back; with the exception of res-delete 4" tips. Just as bit louder than completely stock, but still very quiet overall. I'm very pleased with the set-up.

[slickster]

magnaflow.......

[vkirkend]

That's 2 for Magnaflows....

[johnjamis]

I have the kooks headers/x pipe/magnaflows and it was way too loud for me. I removed the exhaust extensions and replaced them with two magnaflow magnapack bullet muffler tailpipe extensions. This lowered the sound level to slightly more than stock. This does change the exhaust outlet appearance.

[FordNut]

Borla.... The long ones are quieter.

[Marauder Rick]

My super 44s are just a hair above stock. I have fully stock exhaust with the exception of the flowmasters. Silent at idle. the actual volume is very similar to stock but the pitch is a bit lower and the sound has more aggression. So if you're looking for subtle aggression...i would say Flowmaster super 44s is the way to go.

[1stMerc]

Magnaflow 50 series. MarauderTJA has them. Pm him for his opinion

[slickster]

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

[slickster]

thinkin hard bout the hooker maxflow

[SC Cheesehead]

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

Good stuff, John! Looks like the Borla XS would be a good choice for a quiet muffler with good performance characteristics. :up:

Comparative examples of decibel levels. Keep in mind that decibels measure sound intensity; dB level increases are not linear. (A sound level of 110 dB is 16 times as loud as 70 dB.):

Normal conversation (3-5') - 60-70dB

Stock automobile exhaust system (5-10') 65 - 75 dB


Garbage disposal, dishwasher, average factory, freight train (at 15 meters) - 80 dB


Diesel train at 45 mph at 100 ft - 83 dB


Diesel truck 40 mph at 50 ft - 84 dB


Milling machine - 85 dB


Food blender, propeller plane flyover at 1000 ft - 88 dB


Average human pain threshold: 110dB
Live rock music 108 - 114 dB


Riveting machine - 110 dB


Steel mill, auto horn at 1 meter, turbo-fan aircraft at takeoff power at 200 ft - 118 dB

[FordNut]

I believe those test results are for 14" mufflers. Several of those brands also offer 18" versios of the same mufflers, which will be quieter. Thet aren't tested for this table since the longer mufflers won't fit Mustangs and other sporty coupes. But they are perfect for our cars.

[Dobs]

Would be a good addition to put Marauder stock exhaust dB numbers, no?

[slickster]

i think the test car was a 93 5.0 also the best sounding car ever

[DOOM]

Magnaflows all the way if you're looking for a quieter sound.

[na svt]

I'm looking to complete my 2 1/2" exhaust on the original "Impala Slayer" and am looking for mufflers that flow but sound closest to the OEM mufflers (Low noise level) and are stainless. Any suggestions?:dunno:
borla xs pros, $100 on ebay. :banana2:

[vkirkend]

Thanks Guys! The Aeros HAVE TO GO!!!!!!

[DOOM]

What's wrong with aeros? :lol:

[screamn]

I got Borlas on mine. Very quite at idle with no dreaded drone between 50-65 MPH.

However, at wide open throttle, watch out.

Plus lifetime warranty!!!!

[slickster]

Thanks Guys! The Aeros HAVE TO GO!!!!!!

Can I buy them

[vkirkend]

Can I buy them
I promised to give them back to Dave once I have them removed. Otherwise you could have them. (The loudest things I've heard this side of ......you can fill in the blank:(.)

[vkirkend]

what's wrong with aeros? :lol:

too !@$^#)* loud!!!!!!!!

[DOOM]

too !@$^#)* loud!!!!!!!!

You know what they say! If it's too loud then you're too old! :lol:

Hey Kirk you really need to hear mine!!! :D

[ImpalaSlayer]

I promised to give them back to Dave once I have them removed. Otherwise you could have them. (The loudest things I've heard this side of ......you can fill in the blank:(.)

they might find there way on to the bronco :eek:

anyone that ever herd mine said it was the most retardedly loud car they've herd. actually last time you left my house with it Kirk, i said "jesus christ that thing is loud" im pretty sure you were already down my drive way and on your way south already.

[vkirkend]

You know what they say! If it's too loud then you're too old! :lol:

Well I am old.....

Hey Kirk you really need to hear mine!!! :D

I don't remember yours being this loud.