lthompson05

I have Flowmaster 30 series cut-offon my'66 mustang 302right now. It's really really loud. Is there any way I could quiet it down a little, especially at idle?

Flowmaster 40 series***

dodgestang

well running a race only 1 chamber muffler is def. NOT the way to make the car quiet.

In fact, I am willing to bet ANY 2 chamber muffler that many consider loud normally would make you think you are riding in luxury seconds after installing it.

lthompson05

Sorry, typo, I meant 40 series.

boeing747arowair

u mean have 40's now? and want to go to 30's?

lthompson05

I have 40's right now and I want to quiet them down a little bit.

dodgestang

Flowmaster 40s are pretty loud.
A trick a good friend of mine has done (and I plan to do since I run 40s as well with 3 inch pipes) is to install a set of glasspacks in front of them. He did this to make sound tech at one of the track he runs at. If you have 2.5 inch pipes, weld in a pair of 2.5 inch inner diameter glass packs (thrust mufflers I think is another term for them), you won't loose any flow but you will quiet it down. I think a 14 inch should fit between your crossover (x or h) and the front of the 40s.

The alternative is to rip and replace the 40s with a different brand altogether a quick hit of google makes it look like Borla is the only choice for all around quieter in a true performance oriented muffler.

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).

JamesW

I'm pretty pleased with the volume and tone of my Magnaflows...



But I'm not running a Semi-magnet either......

dodgestang

Well Magnaflows are quieter than Flowmasters ;-)

And I'm not a magnet...they just jump out in front of me.

JamesW

That just hurts to think about... Lady luck was riding with you that day...

lthompson05

Well I'm for sure not gonna spend $500+ on new exhaust. I'll look into the glass pack idea though, thanks.