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Author Topic:   Exhaust system design?
SIXD9R
Journeyman

Posts: 19
From: Allentown, Pa
Registered: Mar 2003

posted 04-03-2004 10:20 AM     Click Here to See the Profile for SIXD9R   Click Here to Email SIXD9R     Edit/Delete Message   Reply w/Quote
Hi Guys!
I have a 69 Fastback with a 390. I currently have headers with 3�� collectors and I am looking for suggestions on how to complete the rest of the exhaust system. I want to run true duals out the back and would consider going with all stainless if not too expensive. The car has been lowered a little so ground clearance is also at a premium.

Where is the best place to put the mufflers? I��m thinking they could be squeezed in right in front of the axel? What mufflers would you recommend? The engine has a mild build up and I��m looking for a good strong rumble but not radically loud.

Do the all the pipes need to be completely custom made or is something available?

I currently have header mufflers (With the 3 bolt flange) and then pipes bent at an 80 degree angle that exit in front of the rear wheels but the mufflers are shot and I want to build a good system.

Thanks to all for the help.

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1969 Fastback
390 / 4 speed
3.70 gears

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Moneymaker
Administrator

Posts: 25052
From: Lyons, IL, USA
Registered: May 99

posted 04-03-2004 11:22 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Go to a compitant muffler shop and have them pattern a system after the 70 style incorperating an "H" connector. It will fit, look, and perform well.
I like the Walker Dynomax mufflers myself.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
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Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
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www.moneymakerracing.com

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65ponycar
Gearhead

Posts: 698
From: Dayton, OH
Registered: Jul 2003

posted 04-03-2004 01:50 PM     Click Here to See the Profile for 65ponycar   Click Here to Email 65ponycar     Edit/Delete Message   Reply w/Quote
SIXD9R -

I'm of no help to the question but nice username!

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Tom G
Gearhead

Posts: 552
From: Bethlehem, Pa USA
Registered: Nov 2001

posted 04-03-2004 04:42 PM     Click Here to See the Profile for Tom G   Click Here to Email Tom G     Edit/Delete Message   Reply w/Quote
H pipe with a bolt together flange. Or an "X" pipe sound is awesome. Flowmaster 40's fit nice but are a bit louder.

------------------
67 Mustang F/B 302 GT-40X FMS Crate engine T5, cable clutch conversion Flowmasters X Pipe 4.11 9". Clear water Aqua GT Clone 13.39 on 205/70/14 BFG @104 mph 03 Focus ZX3 BORLA exhaust Wings West spoiler (Arrest ME RED)

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whiteknight289
Gearhead

Posts: 1000
From: Wheaton, IL, USA
Registered: Mar 2004

posted 04-03-2004 05:14 PM     Click Here to See the Profile for whiteknight289   Click Here to Email whiteknight289     Edit/Delete Message   Reply w/Quote
I agree with Alex, Walker DynoMax give a nice rumble, not too harsh, they flow freely and don't cost an arm and a leg. There are a number of bolt-on syste, available for your car with stock manifolds, but the headers will probably require a professional to fabricate the connection to the rest of your system. Since that's the case, might as well let them do the whole thing.

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MCA Certified Judge, 1965-1966
66 GT coupe A code, Silver Frost
65 coupe modified - the White Knight
66 convert being restored
95 GT convertible/Cobra clone - black with white leather

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SIXD9R
Journeyman

Posts: 19
From: Allentown, Pa
Registered: Mar 2003

posted 04-03-2004 08:32 PM     Click Here to See the Profile for SIXD9R   Click Here to Email SIXD9R     Edit/Delete Message   Reply w/Quote
Thanks for the help so far guys. I have more questions though.

Moneymaker, can you explain in more detail what the 70 style system looks like or direct me to a picture or link? Am I correct that the "H" connector is a crossover pipe? Can you please explain what the benefits are? I know the original H pipe had the crossover.

Whiteknight said there are bolt on systems available for manifolds Can someone post a link or picture? I want to get some ideas. I don't mind paying for a complete custom system if I have to, either way I want to get a good system. Sorry if I sound clueless.
Thanks again!

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Hemikiller
Gearhead

Posts: 551
From: Killingworth, CT
Registered: Feb 2002

posted 04-04-2004 05:46 PM     Click Here to See the Profile for Hemikiller   Click Here to Email Hemikiller     Edit/Delete Message   Reply w/Quote
http://www.flowmastermufflers.com/cgi-bin/flowmaster/17334.html

available at www.summitracing.com

~$320

Will fit 65~73 no problems.......

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SIXD9R
Journeyman

Posts: 19
From: Allentown, Pa
Registered: Mar 2003

posted 04-04-2004 10:16 PM     Click Here to See the Profile for SIXD9R   Click Here to Email SIXD9R     Edit/Delete Message   Reply w/Quote
Thanks Buddy. I just spent the last hour at the Flowmaster website. I'm very excited about that system. I got think about it a little more, maybe even call the Flowmaster tech line. I may just go for it and install it myself.

------------------
1969 Fastback
390 / 4 speed
3.70 gears

2003 F-250 Super Duty

20' Tunnel Jet boat 454 Chebby powered...sorry about that

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n2oMike
Gearhead

Posts: 2305
From: Spencer, WV
Registered: Jan 2001

posted 04-05-2004 07:39 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Have you thought about going with removable tailpipes? They take that 'car shaking' resonant vibration pretty much completely out of an exhaust system.
Using collector rings hooked to good reducers and mandrel bent tailpipes works really well... and it only takes a few minutes to remove the tailpipes if you want to hear it 'boom'.

The removable tailpipes also make it easier to remove the complete exhaust system, in case you ever want to run open headers.... or need to work under the car. (this makes transmission service a breeze)

It just makes for an exhaust system that easily adjusts to 'fit your mood'.

Weld a set of those 3-bolt collector rings to the outlets of your 3" mufflers... Then buy a set of Flowmaster $99/pair mandrel bent 2.5" tailpipes and connect them to the mufflers with a set of ordinary header reducers.

This will allow each tailpipe to be removed by taking three bolts loose. Turnouts or turndowns can also be fabricated to fit in place of the tailpipes. (if you desire)

This also makes removal of the entire exhaust system easy. Once the tailpipes are taken off, the rest of the exhaust can easily be unbolted from the headers to run completely open exhaust.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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Tom G
Gearhead

Posts: 552
From: Bethlehem, Pa USA
Registered: Nov 2001

posted 04-05-2004 12:52 PM     Click Here to See the Profile for Tom G   Click Here to Email Tom G     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by n2oMike:
Have you thought about going with removable tailpipes? They take that 'car shaking' resonant vibration pretty much completely out of an exhaust system.
Using collector rings hooked to good reducers and mandrel bent tailpipes works really well... and it only takes a few minutes to remove the tailpipes if you want to hear it 'boom'.

The removable tailpipes also make it easier to remove the complete exhaust system, in case you ever want to run open headers.... or need to work under the car. (this makes transmission service a breeze)

It just makes for an exhaust system that easily adjusts to 'fit your mood'.

Weld a set of those 3-bolt collector rings to the outlets of your 3" mufflers... Then buy a set of Flowmaster $99/pair mandrel bent 2.5" tailpipes and connect them to the mufflers with a set of ordinary header reducers.

This will allow each tailpipe to be removed by taking three bolts loose. Turnouts or turndowns can also be fabricated to fit in place of the tailpipes. (if you desire)

This also makes removal of the entire exhaust system easy. Once the tailpipes are taken off, the rest of the exhaust can easily be unbolted from the headers to run completely open exhaust.

Good Luck!


You can use ball and socket connecters that I beleive flowmaster sells or DR Gas too. they seal alot better than header flanges.

------------------
67 Mustang F/B 302 GT-40X FMS Crate engine T5, cable clutch conversion Flowmasters X Pipe 4.11 9". Clear water Aqua GT Clone 13.39 on 205/70/14 BFG @104 mph 03 Focus ZX3 BORLA exhaust Wings West spoiler (Arrest ME RED)

[This message has been edited by Tom G (edited 04-09-2004).]

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SIXD9R
Journeyman

Posts: 19
From: Allentown, Pa
Registered: Mar 2003

posted 04-05-2004 10:13 PM     Click Here to See the Profile for SIXD9R   Click Here to Email SIXD9R     Edit/Delete Message   Reply w/Quote
Thanks again.
I'm still looking at Flowmaster equipment. I will checkout the ball and socket connectors tomorrow. I found out they have both 2 1/4 and 2 1/2 systems for Stangs.

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My 66 coupe
Journeyman

Posts: 41
From: Fort Bragg, NC
Registered: Feb 2004

posted 04-07-2004 10:42 AM     Click Here to See the Profile for My 66 coupe   Click Here to Email My 66 coupe     Edit/Delete Message   Reply w/Quote
They have the same flow master system at year one for $289 instead of $320. It's always nice to save a little cash when you can!

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