hey guys, with my LT setup i cant stand the drone on my exhaust when pulling(i do a good bit) and am changin my muffler, just not sure which one to change to. i have a 5x8 si/do 18" maggie on there now, and am stuck between then 5x8" si/do 24" maggie #12368 and the 5x11" si/do 22" maggie #12588 with an adapter to get down to the 2.5" pipe from the 3" inlet. im thinkin the 5x11" would have less drone, and am almost to go with that, but i wanna get some input from you guys. so what do you guys think?

thanks
Adam M

 

The 5x8 24" should be quieter, but the 5x11 22" may be a little deeper sounding.

 

This is a great question... Glad you asked because I was kind of wondering the same thing.

Anybody else believe that the 5x11" would give a deeper sound?

 

the quieter outside isn't a big deal, im mainly just lookin to get rid of some drone, a little lower sound would be and added plus tho, even tho it sounds awesome now. so i should have titled the thread "which muffler drones less"....

 

The 5x11 body will be quieter because its 3"s thicker than the 5x8 model, it will absorb more drone sound, even being 2"s shorter than the 24, it will still be quieter inside.

 

so your sayin the 5x11 is the way to go to cut down on the drone..... hmmmm i think thats the way ill be goin.....

and darren....congrats on the 10k posts mark!

 

Yes. It has a thicker case, which means more interior packing to dampen out sound, 3"s more worth. Its your winner for sure.

 

^ I think you may be right here... but I still think it will also be a little deeper.

 

I have listed here a muffler shootout test done by CAR CRAFT:

The Mufflers
MAKE MODEL Part No. COST
SUMMIT Turbo 630125 $14.75
THRUSH Magnum Glasspack 24214 $16.50
THRUSH Boss Turbo 17718 $23.95
HOOKER Competition 21006 $25.95
DYNOMAX Super Turbo 17733 $28.50
DYNOMAX Race Magnum 24215 $31.95
HOOKER Super Competition 21106 $35.95
SUMMIT Fully Welded 630325 $38.69
FLOWTECH Afterburner 50322 $39.95

MUFFLER FLOW TEST

MUFFLER Flow at 28-in H20
DynoMax Race Magnum 528.64 cfm
Thrush Magnum Glasspack 507.40 cfm
Summit Fully Welded 343.38 cfm
Flowtech Afterburner 342.20 cfm
DynoMax Super Turbo 333.94 cfm
Hooker Competition 232.46 cfm
Hooker Super Competition 320.96 cfm
Summit Turbo 331.16 cfm
Thrush Boss Turbo 297.36 cfm

MUFFLER Idle dB WOT dB
DynoMax Super Turbo 89 123
DynoMax Race Magnum 94 133
Flowtech Afterburner 92 124
Hooker Competion 92 122
Hooker Super Competion 90 125
Summit Turbo 89 124
Summit Fully Welded 92 125
Thrush Boss Turbo 90 123
Thrush Magnum Glasspack 92 128

DYNO TEST
All mufflers were dyno-tested on a 355-cube SBC with 10.0:1 compression, Air Flow Research 190 aluminum heads, a CompCams 292 hyd. a Victor Jr. intake, a Holley 750-cfm double-pumper, and 1 5/8 Headman headers.


MUFFLER HP TORQUE 2,500-6,000rpmAverage
Hooker Competition 397.4 381.1 286.8hp/351.9 lb-ft
Thrush Boss Turbo 407.1 384.9 292.1 hp/357.5 lb-ft
DynoMax Race Magnum 409.5 394.3 298.8 hp/366.9 lb-ft
Flowtech Afterburner 409.7 391.2 294.8 hp/361.7 lb-ft
Thrush Glasspack 409.5 389.8 297.7 hp/365.3 lb-ft
Summit Turbo 411.5 386.3 291.5 hp/357.4 lb-ft
DynoMax Super Turbo 412.7 387.2 292.6 hp/358.6 lb-ft
Hooker Super Comp 413.8 387.2 292.8 hp/359.0 lb-ft
Summit Fully Welded 415.4 390.7 295.6 hp/362.4 lb-ft

 

^^I think i've seen you post that about 5 times already today

 

Just wait until he brings out the clay bar trashing in the detailing section

 

wow

 

I've read that a few times, gives RP and rollingrock headaches

 

Is it droning or is it too loud. These can be two different things. Drone is a due to tailpipe design/length. Google Tailpipe Resonance and happy reading. I put on a branch resonator and it helped alot.

 

a bit of both, but more drone than the loudness part.