This is topic would a 3" catback benefit me?? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 9Roush8 (Member # 2472) on :
 
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.
 
Posted by BlackNGold (Member # 655) on :
 
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....
 
Posted by blind (Member # 3052) on :
 
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.
 
Posted by 88DroptopGT (Member # 2535) on :
 
No.
 
Posted by tonster (Member # 6093) on :
 
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.
 
Posted by 9Roush8 (Member # 2472) on :
 
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.
 
Posted by ls1_doc (Member # 6083) on :
 
yeah 2.5 is plenty big ... on dual exhaust it will flow up to 450 - 550 hp according to my magnaflow book.
 
Posted by hidnn.o.s. (Member # 1219) on :
 
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.
 
Posted by 92stangLX (Member # 3252) on :
 
No. You will loose low end torque if you go that big. Stick w/ a 2.5" exhaust.
 
Posted by ls1_doc (Member # 6083) on :
 
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.
 
Posted by MidnightNotchback (Member # 5242) on :
 
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?
 
Posted by JohnB (Member # 969) on :
 
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]
 
Posted by forced331 (Member # 1270) on :
 
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]
 
Posted by Jmir018 (Member # 1414) on :
 
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. [patriot]
 
Posted by JohnB (Member # 969) on :
 
That I can do. Car should be back together by the end of the month with a full 3" system and long tubes. [Smile]
 
Posted by hidnn.o.s. (Member # 1219) on :
 
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]
 
Posted by phildog (Member # 1214) on :
 
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]
 




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