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gibson exhaust?


barn3s
09-06-2005, 02:19 PM
Anyone know anything about gibson exhaust systems? I have a 2003 2.7l taco and thats pretty much all that I've found for it so far so let me know.

ctesla
09-11-2005, 06:04 PM
gibson is a bit pricey, but a good unit.
northwest offroad specialties
or
tacoma territory (both dot coms I believe)
may have other options. and if you aren't committed to a direct bolt-on, 2" to 2-1/2" Dynomax.

now most people will disagree, and preach Flowmaster or some other $200-300 unit, rather than something for $50. some odd bucks...
well, I am not here on commission.
do not get me wrong, Flowmaster is great if you've got 300-500HP you are trying to quiet for the street;

-but my dime goes to the path of least resistance (or flow impedence/back pressure).
before you make any purchase, do your research, call their tech-lines, and ask questions like "free-flow" muffler? or decibel increase? mellow resonance, or raspy? and one of my all time favorites: $.
hope this helps,
chris
nrt racing

ctesla
09-11-2005, 06:30 PM
barn,
by the way: Welcome to Automotive Forums!

had to go find some ammo;
(directly from a valvoline website)

"Backpressure is the Achilles' heel of exhaust systems. Anything that slows down exhaust flow from the combustion chambers compromises engine performance (residual gasses can remain in the cylinders) and generates heat. In turn, heat fatigues metal and weakens the system's structural integrity.

One of the most obvious ways to improve exhaust flow is to remove any kinks from the tubing, just as unkinking the garden hose allows water to flow freely. This is done with a mandrel bender, a machine that drags a metal ball through the tubing to ensure that the inside diameter remains consistent through the bends.

Most OE mufflers also use restrictive mufflers to trap sound. Exhaust passes through the muffler in a lazy-S pattern and goes through baffles into fiberglass packing. Each bend and baffle louver causes friction, which generates heat and causes backpressure.

In contrast, many performance mufflers are straight-through designs—exhaust doesn't have to snake through a chamber, and sound is absorbed through perforations into the acoustical material. These systems run cooler and last longer, and can be "tuned" by their manufacturers to sound more aggressive. "

I think this is the link:

http://www.valvoline.com/carcare/articleviewer.asp?pg=pht20001101cb&print=true

and from a complete Toyota guru's site:

"According to the flowbench, two of the best flowing units you can buy are the Walker Dyno Max and the Cyclone Sonic. They even slightly out flow the straight through designs from HKS and GReddy BL series. Amongst the worst, are the Thrush Turbo and Flow Master mufflers. "

and this IS definitely his (or their) link:

http://www.geocities.com/MotorCity/7177/exhausttheory.html

:2cents: I've been running Walker/Dynomax exhaust on ALL my vehicles, since the mid80s and my first '70-1/2 split bumper Camaro.
on your higher output engine, they will start to shred and blow out (kind of like glasspacks) after two-three years; however, on 245HP and lower applications, I can happily report still resonating on.

hope this helps,
chris
nrt racing

Brian R.
09-11-2005, 11:26 PM
Whoever designed the Camaro exhaust system should be shot.

myronf
09-13-2005, 05:17 PM
I had good results with the gibson exhaust installed on my 2004 tacoma. I had a slight problem due to an incorrect kit sent by the supplier. Be sure that the correct Gibson part number is ordered by your supplier. If I remember correctly, the Prerunners and 4x4's use the same kit.The difference is in the way the tail pipe exits toward the rear and the cab length/model. Gibson responded quickly to my email.

Installation is straight forward. It will help if you have a tail pipe cutter. This will make installing the sleeve easier since there will be a cleaner cut. I had hoped that the kit would be just a bolt on, however I have heard of problems with damage to the O2 sensor. For most people it would be better to leave the sensor alone until it requires replacement, hence the sleeve. I hope this helps.

ctesla
09-14-2005, 08:53 AM
myron is right on with the fact
Gibson is a great unit, AND straight forward being (with certain applications) a true "bolt-up" system.
the exhaust note is more pronounced than stock, but still streetable.
Bosal may make something for the Tacoma as well, and if so, would be around $200USDollars.
exhaust and electrical really suck, as far as mod'ing and working/finxing/
wrenching on, so if fabrication is not your forte', I'd go with a bolt-on as well.

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