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Author
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Topic: Exhaust system
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Fastymz
Moderator Posts: 19583
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 02-18-2004 02:24 AM
   
How about some opionions on a new system for my car. With the new motor a 360-400hp ? 351w that won't see much above 6000rpm. I now have 2.25 pipe with an H-pipe and 3 chamber flows. The pipes have some tight S bends near the collectors do to the fact they exit right before the front cross frame and near the floor. I talked to a different exhaust shop. The owner new what I was talking about before I could finish telling him. He said he could cut and reangle the collectors or shorten them alittle to fit a 2.5" pipe with less bends. He recomended DynoMax ultra flow oval mufflers he said they will out flow and sound better then the flowmasters. He said that the 3" system would be an over kill for my set up.He also likes to use either an H or X pipe.
So what do you guys think ?
The bad part it'll cost me around $400-$500 with him changing the collectors and all.  Or, I could Let him do the new system but add my 2.25" flowmasters 3 chambers to it. So it would be 2.5" or 3" pipe to 2.25 mufflers with turn downs at the axle.This would save me about $150-$180 on mufflers for now, until I can save up and add them later ? ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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ccode67
Gearhead Posts: 2730
From: douglasville,ga,usa
Registered: Mar 2001
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posted 02-18-2004 07:43 AM
Have you thought about one of the exhaust kits from Summit or Jegs, much less money and not that hard to install, mandrel bent pipe too.
Those exhaust kits came out about 3 months after I paid $475 for 2 1/2 and 2 chamber flowmasters with tail pipes at a muffler shop. The kits are like $169 or so.------------------
Stuart
MCA #48902
M&M #1091
67 stang 5 speed, 351W,
Edelbrock Performer RPM package my photo page
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ZEATER
Gearhead Posts: 174
From: Mount Pleasant,IA,USA
Registered: Aug 2001
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posted 02-18-2004 08:56 AM
I switched to an X pipe from Dr Gas and dyno max mifflers from flowmasters. Power and torque went up and noise went down. I also used flowmaster mandrel bent tail pipes. In my application this was the best choice.I have a friend who ran this same system on his stroked small block. He ran faster with his full system then when he disconnected and ran open headers at the track.
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Moneymaker
Administrator Posts: 26513
From: Lyons, IL, USA
Registered: May 99
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posted 02-18-2004 09:18 AM
I'd go with the muffin man's suggestions Scoop.
Flowmonsters blow!
I've heard better sounds from my farts.  ------------------
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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Fastymz
Moderator Posts: 19583
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 02-18-2004 11:24 AM
So would you guys go with the 2.5" or 3" pipe ?
Also X-pipe H-pipe or neither ?
I don't want it loud but I do want it to flow good.------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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Moneymaker
Administrator Posts: 26513
From: Lyons, IL, USA
Registered: May 99
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posted 02-18-2004 11:43 AM
2.5 max.
Do whatever is cheapest at the muffin shop.
You will be running with the headers open at the track anyway.
If you insist on a X-Y-H or Z pipe then take your pick. Just remember that opening headers with one of those things will be a pain.I'm done.  ------------------
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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ZEATER
Gearhead Posts: 174
From: Mount Pleasant,IA,USA
Registered: Aug 2001
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posted 02-18-2004 11:44 AM
I used 3" with Dr. gas X pipe through 3" dynomax into 2 1/2" tail pipes. This is for a 428 stroked to 463 with tri y headers. I would recommend X pipe but 2 1/2 vs 3" would depend on what you feel your exhaust flow would merit.
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Dubz
Gearhead Posts: 1781
From: Manitoba Canada
Registered: Oct 2002
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posted 02-18-2004 01:18 PM
what are your opinions on the cutout deals if you run an X or H pipe? Leaky? not effective? PITA?Not the mr gasket ones with the cable but the ones where you crawl under the car and unbolt the cover
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n2oMike
Gearhead Posts: 2499
From: Spencer, WV
Registered: Jan 2001
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posted 02-18-2004 04:15 PM
As Alex says, as long as you plan on dropping the exhaust for racing... It doesn't matter what it's made of! But, if street performance is consideration, you might want to get a little more creative. I like an exhaust that is easily removable (to make wrenching under the car easier), quiet when I want it to be, legally loud when I want it to be, and totally open with minimal hassle. Sound Impossible???? Read on... Use mandrel bent pipe whenever possible. 99.999% of muffler shops use a standard type hydraulic bender that crushes the pipe. Mandrel benders are very expensive, and are usually set up for volume type work. Below is a comparison between a 'muffler shop' and a mandrel bend... and this is only 2" with a large bend radius. The larger the pipe and the tighter the bend, the more crushed it gets.  The following cross sections were done in the middle of the bend. (same size pipe) 
The biggest kink (tightest bends) in the exhaust system is the tailpipes. Luckily for you, Flowmaster sells 2-1/2" mandrel bent tailpipes for 64-73 mustangs for only $99/pr. Buy a set of these and take them to your local shop when you get the exhaust installed. Most shops HATE to bend large tailpipes for the tight confines of an early mustang... so they will welcome the Flowmaster pipes with open arms. :wink: Most shops won't bend anything over 2-1/4" for early stangs, and even at that, the bends are so tight the pipes get crushed all to sh*t. The Flowmaster pieces also FIT and LOOK way better than those crushed up POS muffler shop units.
Here's the way I would personally set up a good street system. I'd set it up with the 3" exhaust back to 3" mufflers... then weld collector rings on to the muffler outlets to allow the tailpipes to be connected using ordinary header reducers. This will make them easily removable. Being easily removable makes things REALLY nice. Removable tailpipes makes it easy to remove the rest of the exhaust system to work under the car. If using an X pipe, this will be a godsent gift. Tranny work will be a piece of cake! It will also allow you to unbolt the tails for a 3", ground thumpin, good cruisin' time... when you're in that kind of mood. Open headers become a few quick turns of the wrench away. (The 3" will give you room to grow... if you don't think you need it already.) Speaking of tailpipes, I strongly recommend Flowmaster mandrel bent 2-1/2" units. They have a part number that fits 64-73 mustangs, and they sell for only $99/pr. through Summit! Just call them at 1-800-230-3030 and ask for the tailpipes. The tails will make cruising much more comfortable inside the car. Flowmaster also has a complete mandrel bent 2.5" system for mustangs... however, it comes with their mufflers and costs over $300. If you want to go 3", you'll need to buy a bunch of bent pieces and weld them together. Good Luck!
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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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