Custom Exhaust Setup True Dual or Y pipe? - TCCoA Forums
 
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post #1 of 18 (permalink) Old 08-12-2012, 11:15 AM Thread Starter
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Custom Exhaust Setup True Dual or Y pipe?

Hey guys,

Just wondering. I have finished my PI Engine build with Ported Intake and Exhaust ports. I have matching shorty headers for it but I'm not sure what kind of exhaust to put on. I want to get it all done in one shot but I looked on SCP's website and they have two setups. They have a true dual setup and a Y pipe setup. I asked the exhaust shop what they were going to do and they said they were going to put two high flow magnaflow cats, remove the third one. Then they said they would make a Y pipe going to two magnaflow mufflers. The pipe diameter would be 2.25"

Shouldn't it be a true dual system instead. every P.I mustang i see has a true dual setup. The exhaust shop was talking about pressure on the low end or something like that. I didn't fully understand because i don't know about exhaust systems. I can only trust what hes saying. But from what i see everyone has a custom true dual exhaust setup here.

Should I stop him and say I want a true dual setup instead?

Thanks guys
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post #2 of 18 (permalink) Old 08-12-2012, 11:27 AM
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Check out this thread a lot of us here are running this system. from the X back would work best for you IMO.

http://forums.tccoa.com/showthread.php?t=118883

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post #3 of 18 (permalink) Old 08-12-2012, 12:13 PM
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The backpressure theory is complete B.S. A smaller pipe will give better scavenging at lower flows because gas velocity is high, but will restrict flow at higher RPM. A larger pipe will give better scavenging and flow at higher RPM but you'll lose some gas velocity at lower RPMs - reducing the scavenging effect down low and thus torque. This is why you tend to lose a bit of low end torque with a bigger pipe but gain power up top. It is NOT backpressure! Think of what happens with clogged cats. Lots of backpressure - absolutely no power (if the engine runs at all).

2.5" duals are an all around good choice if you are going PI and/or have any further plans down the road. For you since you've got a PI motor with some head work, definitely go duals.

-Brandon
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Last edited by theterminator93; 08-12-2012 at 12:18 PM.
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post #4 of 18 (permalink) Old 08-12-2012, 03:08 PM
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What brandon said. Any sort of back pressure is bad for making power. 2.5 inch duals is prob your best bet, some guys run a 3 inch Y. A quick search should show the differences between the two.

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post #5 of 18 (permalink) Old 08-15-2012, 07:50 AM Thread Starter
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Thanks for all the info
I am running fords shorty headers for a mustang with two magnaflow high flow cats. Deleted the 3rd cat. 2.5 inch pipes going to a 3 inch pipe and back out to 2.5 inch pipes again with magnaflow mufflers. I like how it came out. Ill post a video later on today.
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post #6 of 18 (permalink) Old 08-15-2012, 09:50 AM
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Nice. I've heard that's supposed to be the better flowing exhaust set up between the two. Although it would seem like two 2.5 in pipes would flow better than one 3 in.

-Patrick
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post #7 of 18 (permalink) Old 08-21-2012, 11:47 AM
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I don't think you'll create enough power to take advantage of a true duel exhaust. Single 3 inch exhaust can handle over 500whp. But if you want it go for it. It's your car. If it were me. 2 1/2 inch pipes meet into a single 3 inch y back to a set of mufflers. Done. No cats. No resonator. Unless the law permits.

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post #8 of 18 (permalink) Old 08-21-2012, 02:40 PM Thread Starter
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http://www.youtube.com/watch?v=QB9Jv...e_gdata_player

Thats exactly what i got but theres two cats on it. Thanks again for all the info guys
There is a video of how it sounds.
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post #9 of 18 (permalink) Old 08-21-2012, 04:56 PM
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Quote:
Originally Posted by The joker View Post
Single 3 inch exhaust can handle over 500whp.


You're joking, right?


-Brandon
97 Laser Red Thunderbird LX 161k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
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post #10 of 18 (permalink) Old 08-21-2012, 09:29 PM
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I never really believed that chart. Doesn't seem that accurate but don't take my word for it. Doesn't Robert run 2.5 duals?

-Patrick
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post #11 of 18 (permalink) Old 08-22-2012, 06:12 AM
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Here is another chart that is a little more technical...


-Brandon
97 Laser Red Thunderbird LX 161k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
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post #12 of 18 (permalink) Old 08-22-2012, 10:23 PM
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nice chart
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post #13 of 18 (permalink) Old 08-23-2012, 10:45 PM Thread Starter
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Here is a picture of my setup

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post #14 of 18 (permalink) Old 08-23-2012, 11:13 PM
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You got some rust back there, Shadow21. Maybe a bit of POR15?

BTW - Down here we call that "severely rusted".

RwP
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post #15 of 18 (permalink) Old 08-24-2012, 07:59 AM
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Down Tubes

Quote:
Originally Posted by Shadow21
Here is a picture of my setup

Looks pretty good..

That's a similiar set-up to mine..


The only thing I need to really change on my set-up is the Down Tubes..


I've been looking at these on SuperCoupePerformance



I don't want to spend $200 on a pair of Down Tubes though..


Anyone got a link for a pair of these half price?..






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post #16 of 18 (permalink) Old 08-24-2012, 01:01 PM
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Send that pic to the guys at trubendz. They'll whip up anything-- and it surely wouldn't be $200 for something like those.
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post #17 of 18 (permalink) Old 08-24-2012, 07:27 PM
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Quote:
Originally Posted by guitar maestro View Post
Send that pic to the guys at trubendz. They'll whip up anything-- and it surely wouldn't be $200 for something like those.


Thanks...I'll try contacting them..












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post #18 of 18 (permalink) Old 08-24-2012, 08:26 PM
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There are plenty of people that say true duals. My exhaust guy said it was better with a single 3" in a Tbird since there would be less bends. I have stock PI with a Magnaflow resonator with two in and a single 3" out Ys to 2 Magnaflow mufflers, I also have no cats. Lots of people say that car sounds mean.

Just sharing

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