Dual exhaust setup. 1 muffler 2 in 2 out vs 2 mufflers?

Hello everyone

I own a 2013 toyota tacoma double cab sport 4x4 and I am planning on doing a custom dual exhaust.

So far I am planning on buying a flowmaster super 40 dual in/dual out and add a custom x-pipe all will be 2” piping for the x pipe as well as for the dual exhausts.

Will I see more hp and tq if I use two mufflers instead of one?

Any advice will be of great help, thank you all.

 

Just don't.

 

All you are going to 'see' is unpleasant noise.

If you insist on proceeding, make your design choices based on how you want the tailpipes to be positioned.

 

leave. it. alone.

 

As others before me have said, don't do it for performance gains. Do it only for aesthetics and altered noise if you're into that sort of thing. If I were to add a catback exhaust to mine I would go with the TRD one because I like that low raspy tone it delivers. It's subtle.

 

Trd catback or nothing.

 

Thanks all for your replies.

2 questions.

If I go with duals is there any difference in hp and tq going with one muffler di/do and an x pipe or 2 mufflers also with x-pipe?

Secondly I saw a video and liked the sound of a flowmaster super 40 on a tacoma with stock piping just the muffler swap (note that the stock piping for the tacoma is a single exhaust 2.5”). I will use the same muffler but dual exhausts instead of one and 2” piping instead of 2.5”. Will it sound dramatically different the single exhaust with the the super 40 muffler vs same muffler with duals?

Thanks

 

You will see zero HP gains and zero torque gains. Exhaust is for sound only. Exhaust alone just doesn’t produce any more HP etc.... You have to do new intake and such. Even then you’re out 1200.00 bucks for 1 HP at best.

 

Exhaust and intake do NOTHING

Sound only. I have a magnflow cat back and it sounds good

 

All the above is good advice, if you want to give your money away. give it to charity...
and that is from the Devil !!!!

 

@Kyitty did a full exhaust system change from the motor out. Even did before and after Dyno runs. The gains were pretty small if I remember right. Unless you are going to install a supercharger or a huge, no fun to drive cam you will only really get more volume. I don't think the sound will change from a single muffler or dual mufflers. Maybe the decibel level.

 

I'll join those who have said to leave it alone. Unless it is rotted or damaged do nothing IMHO and spend the same money on something else, or save it for the rainy day that will come.

 

I did my dyno runs before and after long tube headers. Netted 16 peak HP.

The way I'm set up the motor can push more air out. That means there's potential. But until you push more air in (turbo/supercharger) you won't realize much for gains.

I've debated dual exhaust but my local shop doesn't want to do it. He's afraid it'll rob backpressure.

 

Was the HP gain at a usable RPM range? Maybe it's just me getting old, but it I have to rap the hell out of it to feel that power I'm not interested

 

Hard to read since my truck is an auto. Makes for ugly dyno charts.

4,600RPM. So no. Not really usable.

 

When I ran my dual setup, i ran it through an x-pipe, into two mufflers, but that was because the mufflers I wanted to use didn't have the option for di/do. I also had resonators installed to help smooth the sound. I was boosted though, so was able to leverage from the extra volume. As it's been stated above, you won't see much of gains with just a muffler swap. There is more power to be found in the headers and midpipe than the catback.

The 'dual exhaust' you are referring to, is that si/do muffler? or are you planning on doing a custom mid pipe (x/h)?

You'll get the biggest change in sound just changing the muffler, whether it's one or two i doubt would be that different. Running two mufflers instead of 1 might give it more 'depth' if that makes sense, as you'll have two mufflers producing sound instead of one.

 

Ok thanks

I saw gadget with his 3” catback and 3” y-pipe gains hp and tq. I want duals because of aesthetics but also I don’t want to lose power. The majority of dual exhaust catbacks sold my flowmaster, magnaflow and others use a 2.5” in diameter. There is a website I will paste below they test a tacoma with the 2.5 duals from flowmaster and gain 5.6 hp and lose 6.8 tq. Because the pipe diameter it’s too big. I believe 2” for dual exhaust for tacomas is the sweet spot for perfomance if you want to go duals.

Here is the link with the 2.5” dual exhaust catback from flowmaster

http://www.offroadxtreme.com/engine...rs-american-thunder-exhaust-on-a-2015-tacoma/

The muffler I am going to use is di/do and I am going to use a custom x-pipe. All piping will be 2”. So I am doing catback and an x-pipe.

 

I uploaded a photo of a dyno run after installing a Dual 2.5" catback by flowmaster. It gained 5.6 hp and lost 6.8 ft tq. Basically because 2.5" for a dual exhaust is too big for the engine being N/A. That is why I am planning on going with 2" dual instead of 2.5". Also to note that dyno run was without a CAI.

 

This Flowmaster sounds great.

https://youtu.be/x5jl57LlUFo

 

I've liked this one the most

https://www.youtube.com/watch?v=CphC5jrY1No