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Author
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Topic: would a 3" catback benefit me??
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9Roush8
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Member # 2472
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posted
 
 
Like it says im either going to order mac's 3" catback or have a local muffler shop do me a custom 3". Would this be beneficial to me? im going to be running a 2.5 o/r x?? mods are in sig blower to be installed within the month.
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2001 SVT Lightning
Belltech 3/4, 22" rims, slotted rotors, magnaflow high flow mids, bassani catback, JLT CAI
Posts: 788 | From: Manteca | Registered: Feb 2003
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
How much rwhp are you running now?....I don't think 2.5" off road pipe will be that restrictive for your combo...Not to mention that 3" cat backs are hard to fit properly over the axle on lowered cars, especially with a panhard bar like you have....
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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Blind
2.3L
CAFords OG
Member # 3052
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posted
if you're going to have a 2.5" midpipe having a 3" catback wont do shit, thats like using a coffee stir straw to drink out of big gulp.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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tonster
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Member # 6093
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posted
Is the MAC catback 3" all the way through or just 3" tips? 3" pipes won't help, but I'm sure 3" tips would look nice on your Cobra.
Posts: 321 | From: Fremont | Registered: Oct 2005
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9Roush8
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Member # 2472
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posted
the mac is 3" all the way through... i think the 3" is too much im going to go with a 2.5 all the way.
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2001 SVT Lightning
Belltech 3/4, 22" rims, slotted rotors, magnaflow high flow mids, bassani catback, JLT CAI
Posts: 788 | From: Manteca | Registered: Feb 2003
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ls1_doc
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Member # 6083
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posted
yeah 2.5 is plenty big ... on dual exhaust it will flow up to 450 - 550 hp according to my magnaflow book.
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02 Ws6 -- Stock :)
Posts: 132 | From: Redding | Registered: Oct 2005
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hidnn.o.s.
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Member # 1219
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posted
Forced 331 was making 530 at the wheels with 2 1/2 exhaust. He did NOTHING but change to full 3" exhaust and made an additional 36 RWHP. Unless you are making 425 or so AT THE WHEELS, 2 1/2 is fine.
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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92stangLX
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Member # 3252
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posted
No. You will loose low end torque if you go that big. Stick w/ a 2.5" exhaust.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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ls1_doc
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Member # 6083
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posted
quote:
Originally posted by hidnn.o.s.:
Forced 331 was making 530 at the wheels with 2 1/2 exhaust. He did NOTHING but change to full 3" exhaust and made an additional 36 RWHP. Unless you are making 425 or so AT THE WHEELS, 2 1/2 is fine.
i would have to see that one to believe it.
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02 Ws6 -- Stock :)
Posts: 132 | From: Redding | Registered: Oct 2005
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DSGNotch
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Member # 5242
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posted
quote:
Originally posted by ls1_doc:
quote:
Originally posted by hidnn.o.s.:
Forced 331 was making 530 at the wheels with 2 1/2 exhaust. He did NOTHING but change to full 3" exhaust and made an additional 36 RWHP. Unless you are making 425 or so AT THE WHEELS, 2 1/2 is fine.
i would have to see that one to believe it.
I don't doubt it...why should you?
Posts: 224 | From: Healdsburg, CA 95448 | Registered: Jan 2005
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JohnB
Tech Moderator
Member # 969
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posted
Jeesh, I can only imagine what mine would turn. It's 600 at the wheels through a 2 1/2" X pipe and 2 1/4" flowtubes and STOCK Cobra tips. ![[burnout]](graemlins/burnout.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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forced331
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Member # 1270
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posted
quote:
Originally posted by ls1_doc:
quote:
Originally posted by hidnn.o.s.:
Forced 331 was making 530 at the wheels with 2 1/2 exhaust. He did NOTHING but change to full 3" exhaust and made an additional 36 RWHP. Unless you are making 425 or so AT THE WHEELS, 2 1/2 is fine.
i would have to see that one to believe it.
Well it did gain that much. Its a full exhaust w/ H-pipe and with Super40 mufflers and also 3inch collectors, pipes over the axle. No reason to BS! ![[patriot]](graemlins/patriot.gif)
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1992 Ford Mustang LX (Original Owner)"Titanium Frost" 331stroker S-Trim, 5spd
2014 Ford Mustang GT- daily driver
Posts: 1154 | From: Sonoma County | Registered: May 2002
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stangless
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Member # 1414
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posted
well.. i don't think it really matters unless you are putting down a lot of power to the rear wheels. meaning, you wont benefit from it...
Perfect example of this was my former cobra. i had a full 3 inch exhaust since it was stock and made the same power without loosing any torque when comparing it with similarly modded cobras.
Johnb, you should change your exhaust just to see if your numbers increase so we can put an end to this discussion.
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=(
Posts: 4634 | From: bay | Registered: Jun 2002
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JohnB
Tech Moderator
Member # 969
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posted
That I can do. Car should be back together by the end of the month with a full 3" system and long tubes. ![[Smile]](smile.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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hidnn.o.s.
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Member # 1219
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posted
quote:
Originally posted by ls1_doc:
quote:
Originally posted by hidnn.o.s.:
Forced 331 was making 530 at the wheels with 2 1/2 exhaust. He did NOTHING but change to full 3" exhaust and made an additional 36 RWHP. Unless you are making 425 or so AT THE WHEELS, 2 1/2 is fine.
i would have to see that one to believe it.
Believe it ![[Roll Eyes]](rolleyes.gif)
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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phildog
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Member # 1214
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posted
Three inch cat back? Real men use 4" pipes! The bigger the better I say! It's not a matter of too much exhaust, just not enough motor ![[Big Grin]](biggrin.gif)
Posts: 1554 | From: 510 | Registered: Apr 2002
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