Tacoma Noob Exhaust Question

So I bought a 2.7L Tacoma not to long along and want to do some upgrades to it . I want to put a aftermarket muffler on it and from i read the Dynomax Super Turbo meets my requirements the best. I'm just curious to what it will do to my Low End Torque and my performance in general? I also plan on adding a header once i have enough money saved up. It would be great if someone could tell me what will happen to my performance after adding these parts!

 

its honestly not going to do anything noticable

 

Think of an engine as an air pump you need to increase the intake of air and the flow of air in order to increase your performance. So you will see very little difference between stock muffler and new headers and exhaust. You would need to install a col air intake, supercharger, different fuel injectors with a piggy back ECU, a turbo, or something else which will go with your muffler upgrades to increase your horsepower.
If you just change your muffler and headers there was 11-13 horse power difference when I dyno'd it after changing my headers to doug thorleys and doing some other modifications.

 

I'm not looking for a major increase in horsepower, just want my truck to sound a little better but not lose any torque

 

Stay with the same size pipes and a single outlet and you won't lose torque.

 

do you know what the size is? like 2.5in right

 

Measured mine, it's 2 1/4". And from charts that list the proper size pipe for different applications, that is the correct size for a single exhaust on the 2.7L engine.

I changed the muffler on my old truck (98 F-150 with 4.2L) to a 50 Series Flowmaster with a turn-down. IIRC, I did see a slight increase in MPG. I'll dig out my old fuel logs . . .

 

Yes. That's the basic principle.
As long as the exhaust exit remains the same, you're free to mess with the other parameters without losing any low end torque.


The torque peak for a stock 2TR FE 2.7 with the stock exhaust is 3,800 rpm.


The torque peak for a stock 2TR FE 2.7 with the stock exhaust, and an LCE long tube header is 3,150 rpm.


The torque peak for a stock 2TR FE 2.7 with the stock exhaust, an LCE header, and a tooter II.VII intake manifold spacer is 2,900 rpm.

 

Skip the muffler, and go straight for the header and intake.
This is the sound mine makes with both. None of this sound is coming from the exhaust system as it's stock.


http://www.youtube.com/watch?v=H6ofUy8_-6Q

 

It's actually a metric size that's closer to 2 3/8". But if you get a 2 1/4" muffler, the installer will have a hydraulic tool that easily expands the ends in just a few seconds to fit the slightly larger diameter of the stock exhaust pipes.

 

Metric??!?!? But exhaust pipes and mufflers are in inches! I measured mine again with my Harbor Freight caliper. OD is 2.365". Hmmm. Changed caliper to mm. Measured 60 mm. OK, I guess it's metric.

On my old truck, I just cut off the old muffler and tail pipe, clamped on muffler and a 45* turn-down. (I eventually had it welded.) I guess I'm not doing that this time. Aarrggh.

 

Also do the muffler.

I found my old gas mileage logs. Looks like I gained almost 1 MPG! I'll plot it; should be easier to see. I had no way to measure HP, but if MPG increased because of reduced restriction, HP must have also increased. Possibly measurable, but probably not noticeable. But still, little increases here and there can make a difference.

 

Old truck MPG plotted below. I did 10 before and 10 after the new muffler. The red line is where I changed the muffler. The black lines are roughly centered around the MPG, sorta like an average. The first point after the new muffler is low because I was just about at the end of the tank so it is really the pre-muffler MPG. The 2nd point after the muffler is low cuz I was really revving the engine and shifting way late; enjoying my new muffler! Once I got back into my routine driving, kinda hard to say there wasn't an increase in MPG. Don't know if the factory muffler was real bad, or the new one is much better. Probably a combination of the two?

 

which muffler did you install? Ive also been looking at this 18" Magnaflow (#11255) that is also supposed to increase hp and Mpgs.

 

I had installed a Flowmaster 50 Series on my old truck. This has been replaced with the 50 Series Delta Flow. I will probably put that on my Tacoma. Or maybe the 60 Series.

I liked the results with the Flowmaster, so I'm going to stay with them. I would think most aftermarket mufflers would be an improvement over stock.