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post #1 of 13 (permalink) Old 04-20-2011, 11:38 AM Thread Starter
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Pipe Size?

Hey guys, quick question... i currently run 2.5" true dual straigh out the back but i was wondering if 2.5" is to big? What is the perfect size diameter to run?
Thanks
Jeremy

The only engine mods i plan on running is just porting the exhaust manifolds with the PI swap.

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post #2 of 13 (permalink) Old 04-20-2011, 06:48 PM
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Quote:
Originally Posted by N8tiveJuggalo17 View Post
Hey guys, quick question... i currently run 2.5" true dual straigh out the back but i was wondering if 2.5" is to big? What is the perfect size diameter to run?
Thanks
Jeremy

The only engine mods i plan on running is just porting the exhaust manifolds with the PI swap.
What you are running is about what 95%+ people run here. I'd leave it alone, and my opinion is you have the perfect size now.

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post #3 of 13 (permalink) Old 04-20-2011, 07:13 PM
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Here's a handy reference chart someone here had made.



Just keep in mind it's for a reference of how much power the pipes can support; having a single 3" or dual 2.5" on a stock 4.6 doesn't make it a 300hp engine.

Kinda like this:

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post #4 of 13 (permalink) Old 04-20-2011, 08:29 PM
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Another Size Guide

Here is another size guide you may like:

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post #5 of 13 (permalink) Old 04-22-2011, 01:00 AM Thread Starter
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What you are running is about what 95%+ people run here. I'd leave it alone, and my opinion is you have the perfect size now.
Thanks Man, I Think Im just gonna keep the 2.5", it sounds awesome too lol.

Quote:
Originally Posted by 94 Thunderbird XX View Post
Here's a handy reference chart someone here had made.



Just keep in mind it's for a reference of how much power the pipes can support; having a single 3" or dual 2.5" on a stock 4.6 doesn't make it a 300hp engine.

Kinda like this:
LOL! i know right!, some people are ridiculous! thanks for the advice, i think ima stay with the 2.5"

---Jeremy
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post #6 of 13 (permalink) Old 04-22-2011, 08:41 AM
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2.5" is the perfect size pipe I believe. Good size for stock but also leaves you some room to grow. I think a bigger exhaust tip looks good out the back though...I have dual 3.5" tips.

Off topic...that's the wrong car for that motivational pic...too nice and rare of a car.

~Jeff

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post #7 of 13 (permalink) Old 04-22-2011, 08:49 AM
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Quote:
Originally Posted by 94 Thunderbird XX View Post
Just keep in mind it's for a reference of how much power the pipes can support; having a single 3" or dual 2.5" on a stock 4.6 doesn't make it a 300hp engine.

Kinda like this:
http://i270.photobucket.com/albums/j...Horsepower.jpg
That's too good!

John
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post #8 of 13 (permalink) Old 04-22-2011, 10:22 AM
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Quote:
Originally Posted by JeffTBird93 View Post
2.5" is the perfect size pipe I believe. Good size for stock but also leaves you some room to grow. I think a bigger exhaust tip looks good out the back though...I have dual 3.5" tips.

Off topic...that's the wrong car for that motivational pic...too nice and rare of a car.
I agree...and the the right car to use for that picture would have been a Honda Civic. lol

Michael M. ASE P2 Automobile Parts Specialist.

1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016 Trick Flow headded, E85 guzzling beast.

1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.

1998 Mustang GT premium. Trans Go shift kit, Bassani catted x-pipe, PI heads, cams, intake swap, Accufab elbow, SCT Xcal 4 tune, Eibach Pro-kit, Maximum Motorsports Caster/camber plates, fat tires. Banging audio system.
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post #9 of 13 (permalink) Old 04-22-2011, 05:55 PM
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The correct size of pipe depends on the temperature of the exhaust and the rpm range for which you are tuning.
There are guidelines and there is misinformation. To get the right pipe size and length you need to:
1. do the math
2. try and test
3 both of the above.
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post #10 of 13 (permalink) Old 04-23-2011, 10:31 AM
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Yeah I think that's a little too technical for 99% of the people here. Temperature isn't really going to affect an N/A car as much as a turbo car.

~Jeff

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post #11 of 13 (permalink) Old 04-24-2011, 12:21 PM
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Actually the temp is more concern for a NA engine because the temp of the exhause determines the length of the primary tubes for the headers. The speed of sound in the gasses changes with temperature and you need to time the sound pulse so it returns to the exhaust port as the valve opens to get the most power out of your engine. (simplified a bit)
With a turbo you have the pressure of the charge to do the same but from the intake side.
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post #12 of 13 (permalink) Old 04-24-2011, 02:52 PM
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Quote:
Originally Posted by PaulS1950 View Post
Actually the temp is more concern for a NA engine because the temp of the exhause determines the length of the primary tubes for the headers. The speed of sound in the gasses changes with temperature and you need to time the sound pulse so it returns to the exhaust port as the valve opens to get the most power out of your engine. (simplified a bit)
With a turbo you have the pressure of the charge to do the same but from the intake side.
Temperature and pressure are directly related, so that makes sense to me!

~Rick

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post #13 of 13 (permalink) Old 04-25-2011, 11:37 PM
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I'm happy with my 2 1/4" dual exhaust. Eventually when I add a power adder to my 4v (vortech) I'll upgrade to dual 3" for now I'm happy.

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
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-2005 White GMC Sierra 3500 6.6 Duramax, Dually, 4-door, 4x4, Limo Tint, BFG Commercial T/A's, Rancho RS9000XL Shocks, Kenwood Double Din, K&N Intake, Banks Monster Exhaust
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