Mac Shorty Header Comparison - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Focus Fanatics > Ford Focus First Generation > ZETEC Performance (2000-2004)

ZETEC Performance (2000-2004) The place to chat about any 2.0L Zetec engine performance, tuning and exhaust related upgrades.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 03-01-2013, 09:56 AM   #1
79mgb
Focus Enthusiast
 
79mgb's Avatar
 
Join Date: Oct 2012
Fan#: 105006
Location: Orlando, FL
What I Drive: 1979 MG MGB, 2008 Mazda 3

Posts: 153
FF Reputation: 3 79mgb Good Standing Member
Buy-Sell-Trade Rating: (4)
Mac Shorty Header Comparison

I decided to use a Mac shorty header on my build because it's very simple for my application and I should be able to see some gains when it's paired with a 2.25" exhaust (and no catalytic converter). I couldn't find any decent photos of it online so I decided to take some myself. This post isn't a rave review to over-glorify the Mac header but to simply compare an aftermarket shorty to the stock header. You can probably find similar specifications and quality on many other aftermarket headers and that's why I think this comparison is worthwhile for those who are interested in upgrading.

I was able to find a Mac header for an affordable price on eBay (Slightly more expensive than Pacesetter or OBX). It included a copper gasket and was finished with a polished ceramic coating. When I first pulled it out of the box, the ceramic coating looked a little hazy (probably due to some left over residue from the coating process) but some mothers aluminum polish was able to quickly clean it up to a better shine.

As you can see from the photos, the Mac header is a bit larger than the stock manifold. The Mac header's primaries have a 1.65" inner diameter while the stock is about 1.4" (It's been a while since I've measured the stock manifold so correct me if I'm wrong). The Mac header's welds appear to be good on the flanges, as well as the slip fits on the primaries.



The collector size on the Mac header has an inner diameter of 2.5", which is larger than the stock header by .25". The inner weld on the Mac is also not as profound as the stock header which may help with exhaust flow.


The difference in the collector probably helps with flow the most. Ditching the clam shell style of the stock header is probably the biggest improvement for flow.



Overall, It looks like it will be a good performer. I hope this helps people who are interested in upgrading.


79mgb is online now  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 03-01-2013, 01:39 PM   #2
TerryB
Focus Fanatic
 
TerryB's Avatar
 
Join Date: Apr 2006
Fan#: 34559
Location: Riverside, RI
What I Drive: Red '01 ZX3

Posts: 2,917
FF Reputation: 68 TerryB Excellent Standing Member
Buy-Sell-Trade Rating: (2)
Did you do the install yet ? I have an OBX shorty and I had a heck of a time trying to get to all the header bolts. I gave up. I do have a large assortment of tools. I tried evrything I had. I think it was some of the top bolts I had a problem with.
TerryB is offline  
    Reply With Quote
Old 03-01-2013, 02:00 PM   #3
79mgb
Focus Enthusiast
 
79mgb's Avatar
 
Join Date: Oct 2012
Fan#: 105006
Location: Orlando, FL
What I Drive: 1979 MG MGB, 2008 Mazda 3

Posts: 153
FF Reputation: 3 79mgb Good Standing Member
Buy-Sell-Trade Rating: (4)
I mocked it up to my cylinder head when I got it and didn't seem to run into any problems. Did you just have issues getting around the primary tubes?

My build is different than others on this forum since I'm building my engine and installing it in my MGB. I'll have pretty easy access to everything in the engine compartment. http://www.focusfanatics.com/forum/showthread.php?t=302371
79mgb is online now  
    Reply With Quote
Old 03-01-2013, 02:12 PM   #4
TerryB
Focus Fanatic
 
TerryB's Avatar
 
Join Date: Apr 2006
Fan#: 34559
Location: Riverside, RI
What I Drive: Red '01 ZX3

Posts: 2,917
FF Reputation: 68 TerryB Excellent Standing Member
Buy-Sell-Trade Rating: (2)
I think it was behind one of the primaries. I couldn't get any leverage to get one of the bolts started, and couldn't get a wrench near it either. The previous owner definitely got it done. I can see the marks on the flange from the bolts he used. Nice MGB ! My friend had a black on black back in the early '80's. And my brother had a MG Midget in the '70's. I've always liked them.
TerryB is offline  
    Reply With Quote
Old 03-01-2013, 02:54 PM   #5
79mgb
Focus Enthusiast
 
79mgb's Avatar
 
Join Date: Oct 2012
Fan#: 105006
Location: Orlando, FL
What I Drive: 1979 MG MGB, 2008 Mazda 3

Posts: 153
FF Reputation: 3 79mgb Good Standing Member
Buy-Sell-Trade Rating: (4)
Thanks! I really like the car so far.

As far as getting your OBX installed, I've read that getting the bolts started on focus headers can be a bit difficult but not impossible. I'd start a thread, ask for some pointers and reattempt installing them.

I'd highly recommend installing a high flow cat or ORP.
79mgb is online now  
    Reply With Quote
Old 03-01-2013, 03:25 PM   #6
TerryB
Focus Fanatic
 
TerryB's Avatar
 
Join Date: Apr 2006
Fan#: 34559
Location: Riverside, RI
What I Drive: Red '01 ZX3

Posts: 2,917
FF Reputation: 68 TerryB Excellent Standing Member
Buy-Sell-Trade Rating: (2)
Quote:
Originally Posted by 79mgb View Post
Thanks! I really like the car so far.

As far as getting your OBX installed, I've read that getting the bolts started on focus headers can be a bit difficult but not impossible. I'd start a thread, ask for some pointers and reattempt installing them.

I'd highly recommend installing a high flow cat or ORP.
I already have the ORP. That's what I wanted. The shorty was part of the purchase. I just went outside and looked at the header. I can't picture which bolts were the problem. I know leaning over and trying to do it myself was frustrating. I tried the stock studs, bolts, and ARP header bolts. The weather has been crappy around here with no garage. I'll take another crack at it in the spring and have my son give me a hand. It's not essential, but I might as well use it now that I have it.
TerryB is offline  
    Reply With Quote
Old 03-01-2013, 06:06 PM   #7
zetecDon
Where am I?
 
zetecDon's Avatar
 
Join Date: Feb 2009
Fan#: 62506
Location: east of Cincinnati, Ohio, OH
What I Drive: 02 ZX3, 02 MX-5

Posts: 7,479
FF Reputation: 28 zetecDon Great Standing Member
Buy-Sell-Trade Rating: (45)
Installing these types of headers is always easier when the motor is out of the vehicle. TerryB did you take out the fans when you tried to get to the bolts on the stock manifold? I found I had a lot more room to work when the fan was removed. I had plenty of room to work once I removed the whole front end also lol. The one that is on the farthest right side underneath the power steering pump was the one I had the most trouble with.
zetecDon is online now  
    Reply With Quote
Old 03-01-2013, 06:16 PM   #8
TerryB
Focus Fanatic
 
TerryB's Avatar
 
Join Date: Apr 2006
Fan#: 34559
Location: Riverside, RI
What I Drive: Red '01 ZX3

Posts: 2,917
FF Reputation: 68 TerryB Excellent Standing Member
Buy-Sell-Trade Rating: (2)
Yeah, fans were the first thing I did. I learned that with my 4-2-1 install. The usual trouble bolt is the far left ( from the front ). I think on my OBX, it was a top middle one. I put the stock one back on in no time at all. Like I posted above, I'll have my son help. I always forget to take pics, that would explain my troubles.
TerryB is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:43 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.