I have STG II heads and a monster cam going in along with nitrous. WE're looking to hit 560rwhp. I'm planning on going with true duals, however was curious if the sweet thunders flow well (the chambered inside looks like it obstructs flow). I love the sound of them compared to bullets...but if bullets flowed better I would go with them so I can maximize power. Thanks for your inputs.

What would you go with?

 

something i found on the almighty internet

Joe wrote:
Just FYI, check out these #'s when considering exhuast

Muffler Flow Testing

All tests via an independent lab
All tests @ 15” wc

2 “ Straight Pipe 283 CFM
2 ¼ “ Straight Pipe 365 CFM
2 ½ “ Straight Pipe 521 CFM

2 ¼” Typical Bent tailpipe 268 CFM
2 ½” Typical Bent Tailpipe 417 CFM

2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 ¼” Cherry Bomb 239 CFM
2 ½” Cherry Bomb 294 CFM

2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM
2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM
2 ½” Inlet/Outlet Gibson Superflow 267 CFM
2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 ¼” Inlet/Outlet Thrush CVX 260 CFM
2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM
2 ½” Inlet/Outlet Hooker Max Flow 521 CFM
2 ½” Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM

Standard OEM 2 ¼” Inlet/Outlet 138-152 CFM
Standard OEM 2 ½” Inlet/Outlet 161-197 CFM

************************************************** ***************

This test was performed by 5.0 Mustang & Super Fords Magazine, December 2002 issue (page 55) on a '90 Mustang LX coupe with 370hp and 11 second potential. 66 pulls were made for this comparison:

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).

 

I'm not so sure that they'll support the power that your looking to make. The 3" Sweet Thunders have a 2.5" core. I think that's going to choke you pretty good, that's the only reason I didn't buy them.

 

Thanks. I figured at power levels over 400 this would reduce potential power due to the restriction inside. However, I'm not quite sure if this is true. Anyone else have any thoughts on this?

 

Get Moroso Spiral Flows or Flo Pro Twisters. Both are basically the same and flow as well as bullets but are quieter, especially interior drone.

Jason

 

For that kind of power, I would want the full 3" available. Peace of mind that I wasn't losing power, if nothing else.

 

Thanks for the replies. I'm looking for good flow and LOUD! Sounds like bullets are the way to go...too bad, I liked the sounds of the thunders...

 

thunders are plenty loud, and aren't really gonna restrict you as much as you might think. you won't run into a problem unless you're gonna try and push more than 550 or 600hp. especially if you're running sweet thunders dumped at the axle.

 

He said he plans/hopes to push 560 rwhp.

 

My setup seemd to do good on flow for my mods......

Dyno Sheet

 

With a true dual and Sweet Thunders you will have 5" of exhaust between them with a 2.5" inner diameter. And as for restriction you can see right through them.

 

he's not gonna lose 30hp from the thunder's. if he wants the sound, he should get them. i think 5rwhp(if that) is worth great sound.

 

30 rwhp? Where did that come from? They do sound very nice. I need to get some on mine sometime......

 

it was an over-exaggeration to emphasize a point i'd love to run true duals but its just too loud for a daily driver when i have my two little girls.

 

i have sweet thunder true duals dumped...the sound amazing...i can't tell you power difference since i haven't had anything else...

 

2.5" will support up to 450 rwhp. A 3" system reduced to 2.5" in the mufflers may support a little more - may not depending on the muffler(s).

For MAX power I would probably recommend straight bullets, but it will be crazy loud... Twisters will still make excellent power - if not identical - but will not be as loud when cruising.

 

Thanks all for your replies. This is not a daily driver so the drone/loudness doesn't bother me.

Lane -
Do you know approximately how much power would be lost using Sweet Thunders compared to Bullets? Is it something like 5rwhp or something more like 15-20? Also...do you recommend 12" or 18"?

For 5rwhp I would be willing to sacrifice for the sweet sound, but if it's 15 and above I wouldn't.

 

Subscribing