Dual pipin' for exhaust

[SleeperSolara]

Well i was readin' in one of my car magazine's, and i saw that Perrin made an exhaust for the WRX, that had dual 2.5" pipes for the mid-pipe.
I was wonderin' if i could do that for the Y-pipe.
In other words instead of a Y-pipe, i would have 2 2.5" exhaust pipes, 1 from the the and 1 from the rear to the cat.
Wouldn't that be better, than a Y-pipe, or even JP's Y-pipe, and Dat's Y-pipe. I mean if you look at the design the front header pipe runs to the cat, and then the rear header pipin' meets the front pipe in the middle somewhat.
But it think that would make some turbalence like Dat's Y-pipe.
Unless the rear header pipin' runs almost like JP Y-pipe, but we all know that costs almost and arm and leg.
I'm goin' try the dual header to cat pipin' and see what happens.
Let me know what you think about my idea.

[woa_its_j3ff]

i think it's worth a shot +1

[campfire9]

I did something similar in that my muffler guy put new pipes out of the front bank going into a true Y pipe and put a new pipe from the rear bank into the other side of the Y pipe which went to the cat




In the last two pictures you can see that the exhaust just keeps going straight. The pipe os the left is from the front bank and the other pipe is from the rear bank which flow evenly to the cat. I like this better than what I have seen elsewhere.

[Mole]

two 2.5's'' are too big. i'd rather opt for 2''

[SleeperSolara]

"campfire9" How do you like it??
I think where the pipes meet on you dual y-pipe, near the cat is too far spread out??
Maybe that just me.
What size of pipin' do you have on it??

[crispone]

"campfire9" How do you like it??
I think where the pipes meet on you dual y-pipe, near the cat is to far spread out??
Maybe that just me.
What size of pipin' do you have on it??

"TOO FAR SPREAD OUT" is with deference to your AVATAR, sleepyone...

As for campfire9's setup, very nice. There is LITTLE if ANY impact to starting your "mate" into the 'Y' pipe a couple inches apart or RIGHT together, wall-to-wall, IMHO. The determining factor is more a function of the "TAPER" of the 'Y'... If it is REAL ABRUPT because of the "wide" entry... then PERHAPS you are not fully capitalizing on the flow opportunity... wherein a more "gradual" taper may be a "smoother" transition... a LONG as opposed to SHORT 'Y', if you will... FRANKLY, I see no "LOGICAL" difference in this case. I would suspect the setup is more a matter of the 'Y' that was used for the application (assuming it was a pre-existing design) and/or a matter of CLEARANCE and ACCESS for the install. All in all, I think the plumbing looks very "clean" in both it's routing, and flow potential.

Nice work by your shop, campfire9... Did you notice an improvement in:

1) FLOW/PERFORMANCE
2) SOUND (subjective)
3) LOW-END TORQUE (related to backpressure)

I'm thinking your car was S/C? (Don't recall all of a sudden... I remember the BLUE, though! ) If this is the case, backpressure becomes much less desireable... I would suspect.

As for going "BIG" plumbing on a Normally Aspirated vehicle, you are always at risk of affecting some flow characteristics "adversely" when you start changing overall flow volume...

(Come on Phreak, help me out here.... )


.....er.... I might just be "talkin' out my tailpipe" again....



BWAAAAAAHHHHhhhhh ha ha ha ha ha!

-crisp

[campfire9]

crispone, To start with my car is not and never will be S/C. All I have now is the cpe intake and trd muffler. Everything else is cosmetic. I do want to find some equal length headers but I think that is in my dreams.
I just went out and looked under the car-- the Y pipe by itself is about 9" long and appears to be welded to the cat.

To answer your questions :
1. It does appear to flow smoother and has a little more power which in my case is probably subjective
2. Sound doesn't appear to be as ragged as before.
3. I'm convinced I have less back pressure and it does seem to get going easier.

You need to know that I have not had the rpm over 4400. Just part of my upbringing of not wanting engine failure 1000 mi out at sea because someone abused my aircraft engine when they flew my plane. There are people and pilots who don't give a damn how they treat an engine.

I can do everything I need to do under 4400 rpm and that includes out racing cars on the freeway as I'm comming on.

[crispone]

^^^ Very nice. Thank you for the response.


Interesting approach from a man of principle. We could learn alot from you.


-crisp

[DatSRBoi]

Well i was readin' in one of my car magazine's, and i saw that Perrin made an exhaust for the WRX, that had dual 2.5" pipes for the mid-pipe.
I was wonderin' if i could do that for the Y-pipe.
In other words instead of a Y-pipe, i would have 2 2.5" exhaust pipes, 1 from the the and 1 from the rear to the cat.
Wouldn't that be better, than a Y-pipe, or even JP's Y-pipe, and Dat's Y-pipe. I mean if you look at the design the front header pipe runs to the cat, and then the rear header pipin' meets the front pipe in the middle somewhat.
But it think that would make some turbalence like Dat's Y-pipe.
Unless the rear header pipin' runs almost like JP Y-pipe, but we all know that costs almost and arm and leg.
I'm goin' try the dual header to cat pipin' and see what happens.
Let me know what you think about my idea.

The problem with that is our cars are very heavy and underpowered. Having duel exhaust is cool but the problem with that is that youll loose allot of power in the low end making your take off weak and youll end up using more gas. You would think it reduce the stress on your motor by letting it breathe more but your actually putting new stress in your motor by making it work harder to get the car moving. Its only good for high rev or high speed driving like Example the WRX.



The JP system and DatsYpipe was made to where it drops alittle tq to gain more drivable view at the same time not take too much to where your cars over stress.

[Nyyankees3511]

I agree, unless you use the oem diameter you will loose a lot of low end and the car will be slow but high end will be better. You should shoot for a little of both. Good luck.