Aftermarket Cat-Back Exhaust Power?

RagerXS · 05-24-2004, 01:53 AM

From my searches the subject of exhaust gets beat to death but it seems like it is always about the sound. Sure I don't want to ruin my sound, but to me the most important question is whether or not I can get an exhaust upgrade that will improve power without killing fuel economy. The second question would be whether I'm willing to put up with a potentially undesirable sound.

Has anyone ran before and after dyno comparisons of any exhaust? Has anyone compared brands (I know I'm reaching, but this is an established group)?

TIA,
~ Fred

This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!

Praufet · 05-24-2004, 09:07 AM

The usual round of questioning: What year? What engine? ....we need details to really answer the question, but in general exhaust is a mod that you can gain power from and sometimes even gain mpg, its all about improving the efficiency of the engine.

RagerXS · 05-24-2004, 10:46 AM

Rats! And I should know better than that too...

It's a 2004 with 3.4L, and I added this to my sig so I can't forget in the future!

~ Fred

Praufet · 05-24-2004, 04:06 PM

umm...you mean 4.0? the 3.4s were in the third gen. Anywho, generally intake and exhaust mods will not decrease gas mileage. Factory pieces tend to be fairly restrictive so you're basically just improving on the original design. With intake you actually tend to increase the VE(volumetric efficiency) of the engine.

Cebby · 05-24-2004, 05:02 PM

Quote:

Originally Posted by Praufet

umm...you mean 4.0? the 3.4s were in the third gen.

The current TACOMA still has the 3.4 AFAIK.

Praufet · 05-24-2004, 05:52 PM

So I may have kinda sorta missed that in the sig.....

potroast · 05-24-2004, 11:31 PM

yes, the 2k4 taco has the 3.4L... the 2005 will have the 4.0L....

As to answer the question, assuming your driving habits were to remain the same, fuel efficiency would at least stay the same, if not slightly improve with the increased flow of the intake and exhaust. However, as you pointed out, exhaust and intakes are mostly done for the sound, so people will be more heavy-footed on the accelerator in order to hear their newest investment -- this leads to a decrease in fuel economy.

As for a comparison between exhausts, I believe dynomax and magnaflow come in top for performance... Although I can't stand the magnaflow... sounds ricey to me.

RagerXS · 05-25-2004, 06:58 AM

Quote:

Originally Posted by potroast

As for a comparison between exhausts, I believe dynomax and magnaflow come in top for performance...

So the general consensus is that a replacement muffler offers better gains than an entire cat-back system?

If that is true then that is awesome, considering the price difference. But I would have expected that any mandrel bent system would out-perform an exhaust with crimped bends -- even if they are the same diameter (research on this and other sites tells me most replacement systems are the same as OEM in diameter). Would it then hold true that the Magnaflow cat-back should offer the highest performance gain?

~ Fred

05-24-2004, 09:07 AM	#2 (permalink)
Praufet Contributing Member Join Date: May 2003 Location: Fort Worth/College Station, TX Posts: 835	The usual round of questioning: What year? What engine? ....we need details to really answer the question, but in general exhaust is a mod that you can gain power from and sometimes even gain mpg, its all about improving the efficiency of the engine. __________________ --Brian '94 4Runner SR5 4WD 285 Terra Grapplers on FJ80 wheels\|Rancho 9000s on all 4 corners\|Cruiser coils\|Marlin Rear brake line Stereo CDT Audio CL-61A\|CDT Audio CL-6X\|Profile 640 and Profile 600M\|Audiobahn 100Q

05-24-2004, 10:46 AM	#3 (permalink)
RagerXS Registered User Join Date: May 2004 Posts: 18	Rats! And I should know better than that too... It's a 2004 with 3.4L, and I added this to my sig so I can't forget in the future! ~ Fred __________________ 2006 Tacoma Double-Cab 4x4 TRD Off-Road in Silver former 2004 Silver SR5 Tacoma V6 TRD 4x4 former 2002 Red SR5 Tundra owner former 2000 Silver SR5 4Runner owner notice the bad habit?

05-24-2004, 04:06 PM	#4 (permalink)
Praufet Contributing Member Join Date: May 2003 Location: Fort Worth/College Station, TX Posts: 835	umm...you mean 4.0? the 3.4s were in the third gen. Anywho, generally intake and exhaust mods will not decrease gas mileage. Factory pieces tend to be fairly restrictive so you're basically just improving on the original design. With intake you actually tend to increase the VE(volumetric efficiency) of the engine. __________________ --Brian '94 4Runner SR5 4WD 285 Terra Grapplers on FJ80 wheels\|Rancho 9000s on all 4 corners\|Cruiser coils\|Marlin Rear brake line Stereo CDT Audio CL-61A\|CDT Audio CL-6X\|Profile 640 and Profile 600M\|Audiobahn 100Q

05-24-2004, 05:52 PM	#6 (permalink)
Praufet Contributing Member Join Date: May 2003 Location: Fort Worth/College Station, TX Posts: 835	So I may have kinda sorta missed that in the sig..... __________________ --Brian '94 4Runner SR5 4WD 285 Terra Grapplers on FJ80 wheels\|Rancho 9000s on all 4 corners\|Cruiser coils\|Marlin Rear brake line Stereo CDT Audio CL-61A\|CDT Audio CL-6X\|Profile 640 and Profile 600M\|Audiobahn 100Q

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

05-24-2004, 11:31 PM	#7 (permalink)
potroast Registered User Join Date: May 2004 Posts: 62	yes, the 2k4 taco has the 3.4L... the 2005 will have the 4.0L.... As to answer the question, assuming your driving habits were to remain the same, fuel efficiency would at least stay the same, if not slightly improve with the increased flow of the intake and exhaust. However, as you pointed out, exhaust and intakes are mostly done for the sound, so people will be more heavy-footed on the accelerator in order to hear their newest investment -- this leads to a decrease in fuel economy. As for a comparison between exhausts, I believe dynomax and magnaflow come in top for performance... Although I can't stand the magnaflow... sounds ricey to me.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
cat back exhaust	andrew241	86-95 Trucks & 4Runners	26	11-13-2007 10:12 PM
Borla Cat-Back Exhaust, how is it?	petros	95.5-2004 Tacomas & 96-2002 4Runners	11	07-28-2006 11:20 AM
cat back exhaust?	mnm3783	03+ 4Runner/GX470, & 05+ Tacomas	2	03-20-2006 12:12 PM
Quietest aftermarket cat back at cruising speed ?	nrgetic99	95.5-2004 Tacomas & 96-2002 4Runners	7	10-27-2005 12:54 PM
Questions on 1st Gen 3.0 V6 aftermarket cat and exhaust	BNK	95.5-2004 Tacomas & 96-2002 4Runners	2	06-23-2005 12:51 PM