exhaust experiments

[blackbeauty]

Getting a Zoomers and adding a resonator would be similar too have 3 mufflers on one exhaust system. The main muffler, the resonator, and the resonated tip which is similar to a small muffler. I wonder what the results would be powerwise?

[TacoWillie]

Blackbeauty,
Speaking to the local custom muffler shop. They have done several Tundras
lately. They strongly voted against going to a dual 3". They said I'd gain
minimal HP and lose considerable Torque from what they've encountered and
tested so far.
Of the two solutions, I'm leaning toward the 2.25" dual in/dual out which should far outbreathe the factory OEM single pipe, yet maintain a decent amount of backpressure when compared to any catback systems.

[blackbeauty]

Originally Posted by TacoWillie

Blackbeauty,
Speaking to the local custom muffler shop. They have done several Tundras
lately. They strongly voted against going to a dual 3". They said I'd gain
minimal HP and lose considerable Torque from what they've encountered and
tested so far.
Of the two solutions, I'm leaning toward the 2.25" dual in/dual out which should far outbreathe the factory OEM single pipe, yet maintain a decent amount of backpressure when compared to any catback systems.

No. I meant 3" if you went with a single tailpipe, 2 1/4" if you went with 2 tailpipes. That edelbrock muffler is available in both configurations. I would never advise anyone to put dual 3" piping on.

[07 firecrew]

2 1/4 will work best, because all of the duel pipe exhaust use 2-2 1/2 pipes, i think that's too much. you will get a greater benefit with that size. note' if you crimp a 2 1/4 pipe, it's flow is lessened some what.

[TacoWillie]

Gotcha! Thanks guys! I saw the Edelbrock muffler with the 2.25" duals in and single 3" out, but I think I prefer the 2.25" duals out.

[TacoWillie]

ANOTHER concern,
Most muffler shops use typical pipe benders to create their tailpipes in-house and tend to distort and be restrictive at the bends. They are not mandrel bends that remain consistent through the bends.

SO, would a 2.5" shop bent pipe equal to a mandrel bent 2.25" system pipe when you consider the bends????

[blackbeauty]

There is that possibility. In that case the exhaust gases would speed up when going through the bends and slow back down a little when flowing through straight areas of pipe. Personally I think I would stick with the 2 1/4". Remember the stock front piping is 2 1/8" and there are two of those.

[07 firecrew]

the fllowmaster 70 is a big muffler(large capacity) it will be quieter than 95% of the aftermarket stuff, you're on the right track. if you go with a mandrell bent pipe it's better.

[B Square]

Originally Posted by 07 firecrew

the fllowmaster 70 is a big muffler(large capacity) it will be quieter than 95% of the aftermarket stuff, you're on the right track. if you go with a mandrell bent pipe it's better.

I have flowmaster 50 HD 2 in 2 out side exit, no tips. I have pretty bad drone at 15-1700rpm/40mph range when in higher gear plus lesser drone when crusing around 70mph. In your opinion would the addition of tips or resonated tips have any positive effect on the drone? The aero turbine is also certainly worth consideration. You have obviously done your R & D homework on exhaust design, which we all thank you for, and I would appreciate any advice especially from a youngster like yourself!

The old Hot Rodder

[TacoWillie]

I've been researching and researching dual exhausts and been dead set that I was going to go that route.
But recently, I've heard the sound clips over and over on Edelbrock's website and am starting to warm up to a Dual In/Single out application. HOWEVER, they have only two choices for that SDT muffler. 2.25" in or 2.5" in BOTH with a 3" out.
My QUESTIONS:
I'm NOW looking at the 2.25" dual in/3" Single out, w/o a Resonator, with the Edelbrock SDT series muffler. I saw that 07Firecrew did that with the Series 70 Flowmaster......
1. What was the outcome?(NOT considering Noise because of the Edelbrock SDT design being less "droney" than the Flow)Tq loss? I saw you said there was a "lack of power".....

2. Do you need a resonator to adapt down from 3" to 2.5" or do muffler shops have "necked down" pipe sections they can use instead?

3. What is the size of the OEM muffler outlet pipe before the resonator and after the resonator???

THANKS FOR ALL YOUR INPUT!! I know there are a ton of threads I've read through......

[07 firecrew]

go with the 2.5 with the 3'' out and install a aero turbine resonator behind it, you won't be sorry. (AR-25) the single exhaust will give more torque.

[TacoWillie]

07 Firecrew,
I saw someone posted that the OEM inlets to the muffler were 2 1/8" ID.
So, that is why the 2 1/2" inlet size? Gotcha.

I'm gonna go w/o a resonator on the Edelbrock SDT for now since it has all the sound attenuating technology built in. Don't want it to be too quiet. I'll just have the muffler shop neck-down to a 2.5" pipe at the muffler.......Would that work?

[07TuRD]

hey guys. i am a poor college student who just cant afford exhaust right now. i have a TRD dc with the single exit with a tip. I dont know if its the "TRD exhaust" or not cause it does not have the emblem on the tip, but like I said the truck is a TRD.

I really like look and sound of dumped exhaust on my previous trucks. i was thinking about going to my shop and moving the rear exhaust hanger (directly over the axle) a couple of inches back and cutting the stock pipe right after the axle bend and reinstalling the stock tip facing at an angle towards the ground.

i think the sound will be a little throatier which is great and of course will have the more resonance under the bed, but will I lose torque even by cutting this little bit of extra back pressure off??

thanks, Ben

[blackbeauty]

Originally Posted by 07 firecrew

go with the 2.5 with the 3'' out and install a aero turbine resonator behind it, you won't be sorry. (AR-25) the single exhaust will give more torque.

Firecrew,
Why do you think the dual 2 1/2" inlet muffler would be better than the dual 2 1/4" inlet muffler?

[blackbeauty]

Originally Posted by B Square

I have flowmaster 50 HD 2 in 2 out side exit, no tips. I have pretty bad drone at 15-1700rpm/40mph range when in higher gear plus lesser drone when crusing around 70mph. In your opinion would the addition of tips or resonated tips have any positive effect on the drone? The aero turbine is also certainly worth consideration. You have obviously done your R & D homework on exhaust design, which we all thank you for, and I would appreciate any advice especially from a youngster like yourself!

The old Hot Rodder

The tips would help. I also noticed that aero turbine also sells resonator tips for a fraction of zoomers price, but they are a smaller tip.

Firecrew isn't the only person who has gotten good results by putting a resonator behind the muffler. I just read on a Titan forum posts by two seperate guys who weren't happy with the drone they were getting on their Titans are installing a 22" Magnaflow muffler. They had a 12" long Glass-Pack installed behind the Magnaflow and in their words, that too care of it.
So their is something to it. I don't think the factory resonator will do the job because it was designed to work with the factory muffler, but an aftermarket resonator or possibly small muffler seems to work well at getting rid of or at least reducing drone.