So i've decided im gonna go ahead and set up a dumped exhaust. Reading through this forum, i've narrowed down my choices to either a magnaflow or dynomax bullet. I could use some pointers/input however.

Truck is 05 4.2 V6 . I believe stock piping is 2.25? Should I go w/ SISO or does SIDO has some benefits? Should I stick w/ stock piping size or go up to 2.5" instead? I want noticeable rumble/growl during idle and esp. accelerating, but I dont want drone as much as possible. Which of the 14" & 18" magnas is better?

I've read that i'd want some backpressure when dumping muffler. Just wondering why is this? How long of a pipe should I leave out before pointing the tip downwards?

And oh, any negative outcome/effects to underside of truck when dumping a muffler?

Much Mahalo

 

My vote would be for the Dynomax Bullet. Priced right and sounds great. Check out my gallery for pics. Very noticable during acceleration. Very nice throaty sound. The further back you have it dumped the less sound it should be.

 

I've heard good things about the dyno max bullet so I guess my vote will go towards that.

 

dly97, whered you get your dynobullet? i read somewhere that you got it from Jeg's for a really cheap price. Im currently looking at the ones on ebay and they're priced around $50 exluding shipping (to hawaii). and which length do you thing should i get? thx.

 

I got mine from Jegs. It was $33.99 for the muffler and $10.99 for package/handling for a total of $44.98 .
The Dynomax part number is 24215. It is the 2.5" I/O and it's the 12" design. The total length is 16" with the inlet and outlet.

 

Go with a MagnaFlow Part # 12278, got mine on e-bay for $75 shipped...

Sounds good, not as loud as flows... I love mine cause of the quality it is made of stainless steel...

SIDO- 2.25 inlet/dual 3" outlet, I ran mine right before the axel and dumped it. It sounds good when your stepping on it and quiet when your not.

I have to drive alot on long trips and I'm glad I went with the magnaflow, my buddy has the MAC and its obnoxious...

 

Magnaflow or Dynomax, I don't think you can go wrong with either one, since they are both straight though design, nothing to restrict the flow.

 

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So is there less cabin noise if one considers the MagnaFlow over the Dynomax? I like the idea of hearing it when I gun-it but not when I am driving with the kiddos..

 

yeah I wanna know how's the drone from both mufflers. I have an Rcab so muffler will be much closer and I dont want to have to talk over the noise when im w/ gf . I just want the growl/rumble during idle/accelerating, but quiet during highway/freeway speed.

 

the dynomax bullet is slightly-moderatly louder then factory at idle, but sounds great. No drone during acceleration or holding any rpm on cruise cntrl. Only drone i ever heard was from slight accleration up a medium grade hill, like from 25mph - 30 mph. where my rpms where steady speed and engine was under a load. about 2200rpms...

Now that i gutted my precats im getting more drone, and i will hopefully be able to redo my cats in the near future. I want a pipe that flows straight through the cat housing to minimize pressure differences, increase flow, and reduce drone and low poping noises when reving/ engine braking.

Id definetly stick to a SI/SO muffler if you want to dump it, and i havent had any problems with the exaust gasses being dumped under the truck. Will be interesting to see if i notice any signs of wear or stains etc on susp parts or w.e now that i have gutted precats...

Btw dynomax bullet FTW!
-Patrick

 

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