I want to quiet down my exhaust..I need some help.
 

I currently have the Flowmaster American Thunder system on my car. I want to quiet it down so I need to know what you guys think would help, because the Flowmaster 40's are just too loud. Don't get me wrong, I like the rumble, but I plan on driving this and it is just too loud for distance driving. I just don't want the droning.

Dart 400 Short block assembly
Dart 11221111P 72 cc heads with 180 runners
Comp 987-16 1.430 springs
Comp cams hyd roller 294/300 .242/.248 .540/ .562 110 deg lobe.
Comp roller ultra pro magnum roller rockers 1.52
Pro magnum push rods
Dart sportsman II dual plane intake
Holley 770 street avenger
Hooker comp headers 2451 full length
Flowmater 2 1/2 American thunder exhaust and series 40 mufflers
MSD HEI
MSD 6AL2
3.73 gear
3200 stall

we put short resinators on a 71 chevelle with 572 deluxe still rumbles but made a huge
difference inside the car.

Change the mufflers, my choice would be the largest case Magnaflows you can fit. Or, similar-sized Dynomax UltraFlows. Do you have an X or H crossover in the system? That will help too. As will some small bullet mufflers installed in the tail pipes. All of those mods will tone it down quite a bit, but not kill power.

Just my $0.10 worth based on prior experience.

We have been looking at the resinators.

The main body of the muffler is 16 1/2" and is side in/side out, with 2 1/2" pipes.

I have the "H" crossover. We were looking at the Dynomax Ultra Flows. I am going to do more research to make sure that I don't lose power.

The Ultraflows won't give up any power vs. the flowmasters. If anything, it might pick up a little.

Also, check out this article - http://www.pontiacstreetperformance....p/exhaust.html

Very informative and factual.

I will thanks.

I ran the Dynomx Ultra Flows on my 427 Nova. 2 1/2" Torq-Tech duals, Hooker headers, 450 HP engine. At below 3500, they were not real loud, but anything above that and they were way too loud. They made a "blatting" noise. I changed the mufflers to the Turbo ones. Much better sound.

This is the style of muffler I was referring to...

http://www.summitracing.com/parts/WLK-17283/

And I had forgotten about these as an option...

http://www.summitracing.com/parts/WLK-17156/

I actually got to be on a panel to discuss these mufflers before they released them a few years ago. Got paid $100 to show up and discuss + give opinion. Haven't tried them, but pretty cool concept. I am planning to use a pair of Magnaflows on my Chevelle, but a pair of the VT mufflers may be in my future instead.