I have 18 inch bullet mufflers, and I can just feel a cop pulling me over soon. Man what a cam does to wake up the car sound. I was thinking of some 1 chambered flows to quiet it down some. I know they are only 6 inches long and will not help out that much, but has to help out some what. What do you guys think, or any suggestions. (These will replace the 18 inch bullets)

 

if you run the TDs out to the back, it will quiet the car down quite a bit. If you still need more, you can always add a second set of mufflers under the trunk.

 

I thought about all the different ways, running it out the back would be awesome, but i still think the car is too loud.

 

I think you would be surprised. A little bit of extra pipe after the mufflers will reflect the sound back into the muffler, especially if there are some curves in the pipe. For example, i have two magnaflow mufflers on my true dual setup which were loud as hell, almost as loud as dumps were while cruising. After I put my CME on, which was nothing more than two 90º bends and the tips, it quieted down to near stock muffler sound levels at idle and normal cruising... Maybe not really that quiet, but the sound reduction was quite dramatic from just adding the CME alone... I think runining it out the back could make quite a difference.

 

So, for duals on this, I would have to go under the axle because 3 inch pipe would be a bitch to fit over the axle. What do yall think about that, that is the only way to go or maybe some side pipes?

 

Would anyone happen to have photos of the exhaust going under the axle, i have been searching and cant find any. I have seen them before on here, just cant find it. Thanks

 

From the archives....

Results based on 5.0 Mustang Magazine December 2002 issue (page 55). Test car is a ’90 Coupe with 370 HP and 11 second potential. A number of 66 pulls were made to compile this information. Where does your muffler stack up?

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).

 

anything under the car is going to be pretty loud because it reverberates

i would try to fit a pair of dynomax ultraflow welded oval race mufflers under there. they will quite things down a good bit and still flow great so you wont lose and power.

if you really want to quite it down alot than you gotta go out the back

 

Thanks for the numbers and db levels. The only thing, with TSP exhaust, that will almost have to go under the axle. I would still have to think that 18 bullets would be louder than afterburners.

 

I've heard both in person (having owned the Afterburners). You'd be wasting your time by swapping the bullets out for Afterburners. If you want to quiet it down, then get some Magnaflow 4x9 Ovals. They were significantly quieter than the Afterburners, both at idle and part throttle.

 

thanks again, i will look into those, these bullets have to go!