single pipe vs y pipe?
Thread Starter
Melting Slicks
Joined: Feb 2004
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From: Sarcasm. Just one of the many services I offer.
single pipe vs y pipe?
Would it be better to have a single pipe coming out the back instead of a y pipe, so that the air does not have to bend to go out? and then the pipe could exit out the back under the license plate?
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by ir0nmaiden420
Would it be better to have a single pipe coming out the back instead of a y pipe, so that the air does not have to bend to go out? and then the pipe could exit out the back under the license plate?
Drifting
Joined: Aug 2004
Posts: 1,830
Likes: 1
From: atlanta Georgia
well you would have to have a very large pipe!
say a 5 inch diameter pipe.... or else it would acctually restrict air flow.
well what you are trying to do is eliminate back pressure.
are you trying to get rid of you mufllers?
what year is your car and what exhaust mods do you already have?
i think the bend is a negligable amount of back pressure say less than .7 psi
things to ponder:
why dont you just buy muffler elims they are strait pipes from the cat back(no mufflers) they reduce weight abotu 20 lbs and are better than any cat back system. and only $170. search ebay. i bought mine from ladyvettr.
also 1 pipe in the middle will look bad.
its "illegal" not to have mufflers but if they dont see it it wont matter.. with a single pipe that u cna see through ure mor likely to be pulled over.
any questions pm me or email me ...slimshaby@mindspring.com
say a 5 inch diameter pipe.... or else it would acctually restrict air flow.
well what you are trying to do is eliminate back pressure.
are you trying to get rid of you mufllers?
what year is your car and what exhaust mods do you already have?
i think the bend is a negligable amount of back pressure say less than .7 psi
things to ponder:
why dont you just buy muffler elims they are strait pipes from the cat back(no mufflers) they reduce weight abotu 20 lbs and are better than any cat back system. and only $170. search ebay. i bought mine from ladyvettr.
also 1 pipe in the middle will look bad.
its "illegal" not to have mufflers but if they dont see it it wont matter.. with a single pipe that u cna see through ure mor likely to be pulled over.
any questions pm me or email me ...slimshaby@mindspring.com
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
I remember talking about the restrictions in airflow in early C4 exhausts ( 2.25" Y into 3" Single into 2.25" Y ) And it was agreed at the time that due to some fluid dynamics stuff (over my head) that the 3" pipe was not suffocating vs. the 2.25" Y already ahead of it.
Also, I believe if you could tune your exhaust you would want it to drop in diameter further along the way so exhaust velocity maintains artificially constant even though its temperature and true velocity is decreasing.
Or, I am completely wrong.
When I get time I will try to find the post.
Also, I believe if you could tune your exhaust you would want it to drop in diameter further along the way so exhaust velocity maintains artificially constant even though its temperature and true velocity is decreasing.
Or, I am completely wrong.
When I get time I will try to find the post.
Team Owner
Joined: Dec 1999
Posts: 34,873
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
L98 cars had, for all intents, a single exhaust. The pipe from each manifold met at a "Y" and entered the main catalytic converter and exited into a single pipe. Just before the differential, that pipe attached to a "Y" pipe where each half had its own muffler.
Low restriction mufflers, or eliminators does help to reduce backpressure but eliminating the back pressure can reduce low-end power. A true dual exhaust system where a exhaust pipe and muffler handled each cylinder head was typical on pre-smog cars and power gains were made over a single exhaust pipe.
Most cat-back systems do provide small incerases in HP and torque over the factory system due to reduction of backpressure and smoothing out of restrictive bends found in factory pipes.
Low restriction mufflers, or eliminators does help to reduce backpressure but eliminating the back pressure can reduce low-end power. A true dual exhaust system where a exhaust pipe and muffler handled each cylinder head was typical on pre-smog cars and power gains were made over a single exhaust pipe.
Most cat-back systems do provide small incerases in HP and torque over the factory system due to reduction of backpressure and smoothing out of restrictive bends found in factory pipes.
Burning Brakes
Joined: Sep 2003
Posts: 813
Likes: 1
From: Middle Tn
How hard would it be to just go ahead and run two pipes out underneath the car so you would have true dual exhaust? That way you could put an x-pipe on it. I have always wanted to do that to my 91 and just wondered how hard it would be.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Mid-America sells a true off-road dual exhaust system for 84-91 cars:
http://www.madvet.com/shop?frame=1.928
http://www.madvet.com/shop?frame=1.928
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Burning Brakes
Joined: Sep 2003
Posts: 813
Likes: 1
From: Middle Tn
That would sure be awesome, but without cats and mufflers, it would be way too loud for the boss lady. It seems like it would probably be cheaper to find a good muffler shop that could make the pipes for you and then put some hi-flow cats and good mufflers on it. I believe it is Dr. Gas that sells pre-made X-pipes, so you could buy them too. Thanks for that link on those pipes.
Thread Starter
Melting Slicks
Joined: Feb 2004
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From: Sarcasm. Just one of the many services I offer.
Originally Posted by c4cruiser
Mid-America sells a true off-road dual exhaust system for 84-91 cars:
http://www.madvet.com/shop?frame=1.928
http://www.madvet.com/shop?frame=1.928
Thread Starter
Melting Slicks
Joined: Feb 2004
Posts: 3,055
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From: Sarcasm. Just one of the many services I offer.
I wonder how much I would gain with the muffler elims too...does it eliminate the precats?
I wonder how hard it would be to take off come inspection time....
I wonder how hard it would be to take off come inspection time....
Last edited by ir0nmaiden420; Oct 4, 2004 at 09:25 PM.
Thread Starter
Melting Slicks
Joined: Feb 2004
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From: Sarcasm. Just one of the many services I offer.
Originally Posted by SBNova
Single exhaust exiting under the liscense plate?- good luck getting your spare tire out!!
Drifting
Joined: Feb 2003
Posts: 1,974
Likes: 2
From: San Antonio Texas
Originally Posted by c4cruiser
Mid-America sells a true off-road dual exhaust system for 84-91 cars:
http://www.madvet.com/shop?frame=1.928
http://www.madvet.com/shop?frame=1.928
Unless they've changed it, it's only 2 1/4" pipe. You'd want 2 1/2" pipe. For a "true-dual" setup you'd need to try a muffler shop, and a X or H pipe would be a real good idea; more power, better sound.
And.... two pipes flow better than one, and what about the spare, as was mentioned.
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Why
I don't think you would get a gain and it would look terrible. Try to get muffler eleminators. They still use the cats (for the law) have a great sound. Save weight. Much cheaper.
duals 
