Author
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Topic: Exhaust system design?
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SIXD9R Journeyman Posts: 19 From: Allentown, Pa Registered: Mar 2003
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posted 04-03-2004 10:20 AM
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.
------------------ 1969 Fastback 390 / 4 speed 3.70 gears
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Moneymaker Administrator Posts: 25052 From: Lyons, IL, USA Registered: May 99
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posted 04-03-2004 11:22 AM
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.------------------ 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 First SS/MA in the TENS! IHRA division 5 Superstock Champion Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked." Quote #2: "Make sure brain is in gear before engaging mouth!" Quote #3: "If you can't run with the big dogs, stay on the porch!" www.moneymakerracing.com
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65ponycar Gearhead Posts: 698 From: Dayton, OH Registered: Jul 2003
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posted 04-03-2004 01:50 PM
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
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posted 04-03-2004 04:42 PM
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
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posted 04-03-2004 05:14 PM
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. ------------------ 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
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posted 04-03-2004 08:32 PM
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
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posted 04-04-2004 05:46 PM
http://www.flowmastermufflers.com/cgi-bin/flowmaster/17334.htmlavailable 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
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posted 04-04-2004 10:16 PM
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
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posted 04-05-2004 07:39 AM
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
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posted 04-05-2004 12:52 PM
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
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posted 04-05-2004 10:13 PM
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
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posted 04-07-2004 10:42 AM
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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