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Author
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Topic: H-pipe or no H-pipe?
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thumpin cat
Gearhead Posts: 129
From:
Registered: Mar 2002
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posted 03-15-2003 06:07 PM
  
i am building a 450 horse 351w with 3 inch exhaust, 1 chamber flowmastes and dumps, i dont know if i should use an H-pipe. i want my exhaust to be loud but sound good. what do you think? please let me know thanks a lot.
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Toronado3800
Gearhead Posts: 191
From: St. Louis, MO
Registered: Jul 2001
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posted 03-15-2003 06:48 PM
I hear the "H" pipe helps. If I'm looking in my NPD catalog right they sell some factory style H pipes.In the past I owned two "H" pipe exhausts. The one I had done locally ended up being a 1/2 inch hold torched ROUGHLY in my pipes and then joined with a 2 1/2 inch tube. My next was a Flowmaster "H" pipe on a Pontiac and was NOT happy with the quality. Darned thing always leaked and caused much more trouble than the 8 HP it was supposed to create. Coulda been an installation problem though. So this time I just got straight 2 1/2 inchers.
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kid vishus
Gearhead Posts: 3894
From: middle of NC
Registered: Oct 2000
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posted 03-15-2003 07:01 PM
3" pipes and 1 chamber flowdisasters? Yep, it's gonna be loud. More than likely it will be loud enough the cops will get to know you on a first name basis.
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Fastymz
Moderator Posts: 9095
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-15-2003 07:30 PM
quote:
Originally posted by thumpin cat:
with 3 inch exhaust, 1 chamber flowmastes and dumps, i dont know if i should use an H-pipe. i want my exhaust to be loud but sound good.
I dont think an H-pipe will do any thing for you.
Not sure if it will sound good,but it will be LOUD. 
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SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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steve'66
Gearhead Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-15-2003 08:05 PM
I'm with Scoop on this one. Is this gonna be a street car? 1 chambers should be labelled "for off road use only".  SteveW And if it is a racecar, don't bother with the h-pipe.
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Fastymz
Moderator Posts: 9095
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-15-2003 08:13 PM
quote:
Originally posted by steve'66:
[B]I'm with Scoop on this one. SteveW B]
WOW,I have to print this and frame it. ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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steve'66
Gearhead Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-15-2003 08:16 PM
You've done well "grasshopper"  SteveW
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bluestreek
Gearhead Posts: 1086
From: Athens,GA
Registered: Jul 2001
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posted 03-15-2003 08:16 PM
I have never used an H-pipe. Every time someone makes a HP claim with one, they always seem to add bigger pipes and mufflers too, so you never know if it's worth anything or not. I like being able to move the pipes around for xtra work space if needed. If I ever decided to use one I'll make it so the whole section can be removed from the collector to the mufflers. I do know that larger pipes and mufflers are much louder because they allow more expansion inside the pipes. I don't think an h-pipe will help you much as far as making it quieter. I use large fiber-filled resonator tips to quiet my 2-chamber flows down on my '66. They are straight thru design and have very little back pressure.Dan ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
e.t. 12.50 @ 112 mph
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Fastymz
Moderator Posts: 9095
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-15-2003 08:20 PM
quote:
Originally posted by bluestreek:
I like being able to move the pipes around for xtra work space if needed. If I ever decided to use one I'll make it so the whole section can be removed from the collector to the mufflers. Dan
Dan thats a great reason not to have one.Working with my long tube headers now,I sure wish I didn't have a H pipe.
Next time I'm going with 3" pipe NO H-pipe.
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SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Dubz
Gearhead Posts: 243
From: Manitoba Canada
Registered: Oct 2002
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posted 03-15-2003 08:58 PM
if you have little backpressure from big pipes you don't need the pressure balance that an h or x pipe would give you....
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bluestreek
Gearhead Posts: 1086
From: Athens,GA
Registered: Jul 2001
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posted 03-15-2003 09:38 PM
Here's something to think about. I still have the same 2 1/4" non-mandrel bent exhaust and no crossover behind my 331 stroker and still ran over 112 mph in the 1/4 just taking it easy. The darn thing runs quieter now than it did with the little 300HP 289 in it. 100 more HP made it run quieter!! Does that makes sense? GO figure!  Dan ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
e.t. 12.50 @ 112 mph
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steve'66
Gearhead Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-15-2003 10:06 PM
Dan,I'd like to see what yours would run with open headers. Can you run it open and find out? Worth 3-5 mph on most cars that I've seen.
Maybe yours is the exception. SteveW
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bluestreek
Gearhead Posts: 1086
From: Athens,GA
Registered: Jul 2001
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posted 03-15-2003 10:42 PM
You're probably right SteveW. This little exhaust system makes my motor sound like it has a corn cob stuck up its pipe. Dan
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Rustang
Gearhead Posts: 403
From: Clarion PA
Registered: Nov 2000
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posted 03-17-2003 01:20 PM
An H-pipe should make the car quieter. X-Pipe even more.
I also think Flowmasters are quieter the stronger your exhaust pulses are. The only experience I have with Flows is on my pickup. It's loud as hell at idle, but doesn't get as loud as you'd expect at higher r's. ------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
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