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What is difference between Pacemaker 4499 and 4480? 

 

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 Post subject: What is difference between Pacemaker 4499 and 4480?
Posted: Mon May 14, 2007 10:40 pm 
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as above

Last edited by 1993_EBII_XR6 on Tue May 15, 2007 6:39 pm, edited 2 times in total.

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Posted: Mon May 14, 2007 10:45 pm 
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4499 make torque at mid to high rpm, 4480(comps) make torque everwhere in the rev range.

 

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Posted: Mon May 14, 2007 10:47 pm 
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and about $150 difference!

 

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Posted: Mon May 14, 2007 10:47 pm 
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mad. thanks champ!
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Posted: Mon May 14, 2007 10:48 pm 
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4499 are 6>2>1's. The secondaries being 48mm (x2).

4480 are 6>3>1's. The secondaries being 44mm (x3).

The 4480 are sold as a "Competition Header". They should flow a greater volume, having more collective volume after the primary pipes. I think they're more suited for mild to warmly worked motors.

 

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Posted: Mon May 14, 2007 10:54 pm 
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just wondering. if i just buy only the headers themselves. do i just bolt them on or do they need to be welded to cat?
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Posted: Mon May 14, 2007 10:55 pm 
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theres a bit of work involved, cause they are a bolt on, but you need to modify the stock cat cause they are longer then the stock extractors.

 

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Posted: Mon May 14, 2007 10:56 pm 
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this has been asked so many times. http://www.fordmods.com/forums/viewtopi ... 75&start=0

 

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Posted: Mon May 14, 2007 11:00 pm 
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that doesn't really help me that much at all.

what needs to be done to the cat?
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Posted: Mon May 14, 2007 11:04 pm 
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1993_EBII_XR6 wrote:
that doesn't really help me that much at all.

what needs to be done to the cat?


sorry mate i wasnt refering to the cat question.
i was talking about the 4499's vs 4480's

 

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Posted: Mon May 14, 2007 11:10 pm 
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2 problems with fitting extractors on stock cat
1)the pacemaker extractors are longer then the stock ones so they you need to cut the front tip of the cat off
2)the opening of the cat is smaller then the end of the extractors so u need to cut the standard cat up then flick the ends up to 2.5" to be able to slide the 2.5" tube in to it...
hard to explain ill try and get a pic tomoro

 

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Posted: Mon May 14, 2007 11:12 pm 
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The competitions are tuned length extractors - i.e. all pipes are the same size. At a particular chosen rpm there is therefore maximum efficency (high and low gas pressures - scavenger effect type stuff), and decent efficency getting worse either side of that. The normals don't have this and are just out of tune the entire time.

 

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Posted: Mon May 14, 2007 11:13 pm 
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4dlvr wrote:
theres a bit of work involved, cause they are a bolt on, but you need to modify the stock cat cause they are longer then the stock extractors.


They're straight replacement bolt onto the head.
BBut the front flange on the cat converter will need to be altered. Possibly the rear aswell.

 

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Posted: Mon May 14, 2007 11:22 pm 
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how much would it cost to get them put on properly?
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Posted: Mon May 14, 2007 11:24 pm 
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it really depends, your best option would be to call up a bunch of places and get some quotes.

 

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