Diameter piping?
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Diameter piping? - 2/1/2006 7:29:07 PM
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strongboy2005
Posts: 170
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My local muffler shop does a custom cat-back exhaust with your choice of muffler for $275. My question is what diameter piping should I look into getting for the best performance gain... They will go up to 3" on their piping, is that too big?
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2003 LS (4-door) Chevy Blazer 4.3L 2WD GU6 G80
http://www.cardomain.com/ride/2257682
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RE: Diameter piping? - 2/1/2006 7:32:15 PM
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4lowlife
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Real expensive if you want stainless and stainless weld.
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RE: Diameter piping? - 2/1/2006 9:27:22 PM
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4lowlife
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I think it would be fine if its installed after the cat. Are you going to use the factory muffler?
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RE: Diameter piping? - 2/1/2006 10:29:14 PM
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4lowlife
Posts: 1562
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I didn't know what the forlmula was for determining the exhaust diam.
On my "01 Impala I had the resonator removed and a Y pipe installed behind the gas tank. From there two stainless mufflers welded on. so from the cat on back, the diameter went from 2.25" to 2.75." Ran fine but the droning was excruciationg when ya had a hangover.
After a few years from driving and sitting in the snow, (I did not have a garage yet, nor did I shovel,) the aluminized pipes rusted.
I ended up getting stainless pipe put on, magnaflow resonator and, two new mufflers. Costing almost $1,000.00. (2.50" diam by the way.)
See what the diameter is on the cat back kits that are out there. Might be be a good reference.
< Message edited by 4lowlife -- 2/1/2006 10:32:31 PM >
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RE: Diameter piping? - 2/2/2006 2:01:00 PM
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Hanr3
Wheels & Tire Moderator
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First off you cannot "gain hp" from an exhaust systtem. The hp comes from the engine, the exhaust system restricts the amount of hp the engine can create.
The simple answer to your question. 2 1/2" pipe.
The muffler with the best flow rate is a glasspack.
Most aftermarket performance mufflers have baffles that redirect the air flow to aquire a tone. They provide less restriction compared to a stock muffler, and thus increase your engines hp slightly, less then 5hp. A stock muffler runs the air through the muffler 3 times before it exits the muffler.
The best investment, if you really want to increase hp, is to get rid of the stock exhaust manifolds in favor of some headers. The exhaust manifold/headers, collector pipes, y-pipes is where you will have the most effect on your engiens performance. By time the exhaust gets back to your muffler, there isn't much difference you can make in freeing up engine hp.
The cat back system is designed for sound. Is that tone really worth $300.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: Diameter piping? - 2/2/2006 3:40:20 PM
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strongboy2005
Posts: 170
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quote:
ORIGINAL: Hanr3
First off you cannot "gain hp" from an exhaust systtem. The hp comes from the engine, the exhaust system restricts the amount of hp the engine can create.
The simple answer to your question. 2 1/2" pipe.
The muffler with the best flow rate is a glasspack.
Most aftermarket performance mufflers have baffles that redirect the air flow to aquire a tone. They provide less restriction compared to a stock muffler, and thus increase your engines hp slightly, less then 5hp. A stock muffler runs the air through the muffler 3 times before it exits the muffler.
The best investment, if you really want to increase hp, is to get rid of the stock exhaust manifolds in favor of some headers. The exhaust manifold/headers, collector pipes, y-pipes is where you will have the most effect on your engiens performance. By time the exhaust gets back to your muffler, there isn't much difference you can make in freeing up engine hp.
The cat back system is designed for sound. Is that tone really worth $300.
So basically you are suggesting that for the best power to $$ value to skip the cat-back and go straight to an aftermarket header, collector pipe, and y-pipe?
You know of any companies that make these components for my application?
_____________________________
2003 LS (4-door) Chevy Blazer 4.3L 2WD GU6 G80
http://www.cardomain.com/ride/2257682
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RE: Diameter piping? - 2/4/2006 6:15:50 AM
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Hanr3
Wheels & Tire Moderator
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Try Headmann headers, and the others listed above, most make complete systems.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: Diameter piping? - 2/4/2006 8:14:13 PM
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20Blazer00
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Here is a comparison pic I shoped together to show the differnce between the 2 models of gibson exhaust for the 2dr that you refer to. As you can see the ZR2 only version (Bottom) looks almost identical to the standard non zr2 (Middle) version. So I would consider sending them an e-mail asking them if the 4dr model (Top)shown will work for your 03...
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< Message edited by 20Blazer00 -- 2/4/2006 8:15:56 PM >
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2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: Diameter piping? - 2/6/2006 6:17:57 PM
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cherryred4x4
Posts: 382
Joined: 1/20/2006
From: Raleigh, NC
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I have a Dynomax cat-back on my 95 that I got from summit racing. It is 2 1/2 inch piping, 2 1/2 is big enough for a Blazer, stock is 2 1/4 I believe. The only real thing i got out of it was 1-2 MPG and the sound, not much performance gain.
I looked on www.truckperformance.com and www.summitracing.com and didnt find any cat-back systems for your a non-ZR2 blazer. I agree with 20Blazer00 to check with Gibson and find out what the difference is between the kits....the ZR-2 may fit. You can also try searching google or another search engine for 2003 blazer performance exhaust.
As far as the headers, I think Edelbrock makes some, and heres a link to JBA headers for your 2003... JBA Headers
I wouldnt expect to pay less than $500 for headers, and then its pretty tight in the engine bay, so installing them will be a pain.
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