mufflers

check spintech. they have many different configurations and they sound fantastic. good luck. Ken

Dynomax large case super turbo or accurate ltd hi po muffler.

at the current time i run 4 inch magnaflow i just hate the noise i waNT IT TO BE QUIET AND FLY

I'm happy with the pair of Hooker Aerochambers

I recommend Borla XR1 12" body. They arent cheap but they are unbelievably wicked sounding and sound like a kitten at idle.

I have always liked Borlas, well that is after Scott Brown no longer made mufflers. We have his stuff on our Camaro(sorry)and it is quiet as a church mouse and still runs bottom 10's. Anyway the key is to put the muffler as far back as possible in the car. By the rear bumper if possible as the last part of the exhaust before the tip.

I think the D-max Ultraflows sound great but are not gonna qualify as "Very Quiet" On a big motor car with 11.5:1 and a big cam they don't knock the DB's down very much...If you look at an UF it's essentially a perforated resonator tube in a muffler case.

D-max Hemi Turbo's really are reasonably quiet but arguably more restrictive than Ultraflows on a big motor at high RPM. But Real world 95% of the time... not very much performance difference on a properly designed system with collector extentions and an X pipe. I run them on a 12:1 ~720hp 517 and they're quiet "enough" ....barely. I had considered Ultraflows for this motor but with the cam and overlap I might as well run open headers as far as knocking down the Decibels. On my old 600 hp 508 they would have been fine though.

Dynomax has a muffler that is a hybrid of a short Ultraflow with a spring loaded Flapper valve, that may be worth looking at.

Hooker Aero's sound really good and are low restriction...based on your request that might be one worth looking at.

Edelbrock Stainless mufflers that had a split flow -<>- (Like an Ultraflow but with a double Y in the case) are fairly quiet and very low restriction as well. I think they copied the design from the SLP Firehawk. Not sure if they still make them anymore though, but they're a nice alternative.

In many states they're is an 80 or 85 DB max at 100 feet before they can cite you for noise.

Hi,
are there any round type that you could slip on a collector to quiet it down some? without doing an actual exh system 3 1/2in. collector. this is for a race car.
Russ

Did anyone read the OP?? He said "very quiet". Maybe he should have given a decibel reading he wanted to stay under, cause none of the muffs listed fall in the very quiet catagory IMO. Straight throughs of any kind shouldn't even be a consideration - unless they are mounted on a sewing machine .

about 8 months ago metal storm posted a link with Db levels of 10 muffs from the mufflerguy on yellowbullet.com,it was in the race sec on moparts.
here it is.
https://board.moparts.org/ubbthreads/show...rue#Post6519022
For reference, a 14 dB increase doubles the sound level, while 60 dBs represent normal conversation and 90 dBs are considered the threshold for pain.

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, 91db at 2,000 rpm, 114db at WOT.
4. Flowmaster 82db at idle, 93db at 2,000 rpm, 115db at WOT.
5. Flowtech Warlock 83db at idle, 92db at 2,000 rpm, 112db at WOT.
6. Dynomax UltraFlo 83db at idle, 94db 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, 120db at WOT
11. FlowtechAfterburner 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12. FlowtechTerminator 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. No Muffler 91db at idle, 103db at 2,000 rpm, 120+db.

some added info.
Here's the rest of that chart. It shows dyno hp and muffler flow. You should be able to make a reasonably good decision using this info. Any muffler info that I post, is a muffler that I have personally installed for people and can verify the sound levels on.

This review was performed by Martel Brothers:

2 " Straight Pipe 283 CFM
2 1/4" Straight Pipe 365 CFM
2 1/2" Straight Pipe 521 CFM

2 1/4" Typical Bent tailpipe 268 CFM
2 1/2" Typical Bent Tailpipe 417 CFM

2 1/2" Hooker Max Flow 521 CFM
2 1/2" Ultraflow Bullet 512 CFM
3" Flowmaster 3-ch Delta 40 389 CFM
2 1/2" Borla Turbo 373 CFM
2 1/2" Flowmaster Super 40 352 CFM
2 1/2" Flowmaster (2 Chamber) 249 CFM
2 1/2" Hooker Aero Chamber 324 CFM
2 1/2" Maremount Cherry Bomb 298 CFM
2 1/2" Magnaflow (Chambered) 284 CFM
2 1/2" Dynomax Super Turbo 278 CFM
2 1/2" Gibson Superflow 267 CFM
2 1/2" Flowmaster (2 Chamber) 249 CFM
2 1/2" Flowmaster (3 Chamber) 229 CFM

3" Flowmaster "Super 40" 426 CFM
3" Magnaflow (straight) 622 CFM

3" Flowmaster 3-chamb Delta 40 365 (offset/offset #943043)
3" Flowmaster 3-chamb Delta 40 389 (offset/center #943041)
3" Flowmaster 3-chamb Delta 40 410 (center/center #943040)

-----------------------------------------------

This test was performed by 5.0 Mustang & Super Fords Magazine, December 2002, on a '90 Mustang LX coupe with 370hp and 11 second potential:

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 / 333.0 tq
4.Borla XS 373.3 hp / 332.6 tq
5.Magnaflow 372.8 hp / 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 372.0 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 370.0 hp / 334.0 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 hp / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq

17.No muffler 365.2 hp / 330.1 tq
__________________
Rob Wade
See more of my work.....
http://s268.photobucket.com/albums/jj24/mufflrguy/

I'm interested in this info as well.

I need a single 4" for mine.... and like everyone else I want it to be quiet without costing me power. I'm thinking my single 3" exhaust is costing me some - or maybe even alot since it's a magnaflow on a full exhaust system. How big of an exhaust does 700hp need to have without it costing power?

i'm running a 3 1/2" system with magna flows, over 700 hp. it's noisy, so what. i like it & so does everyone else who hears it. i agree with crizila, there isn't any muffler that is real quite & won't rob power. i tried almost all of them. seeya.

I also don't recommend the Dynomax for quiet. I have a 4" dumping into a 3-1/2" on each side and my car's FAR from quiet. 108 DB at PIR last time out and I got sent home after the third pass.

They measure from way up at the top of the grandstands, I think about 50' from the car. The limit at that track is 103 DB.

I run Magnaflo's and they are not quiet...