MAC headers
MAC headers If I can get a set of MAC midlength headers and both offroad and catted y-pipes for cheap is it worth the gain in hp or should I wait and spend the extra for long tubes? TIA
Kirk
Kirk
I think it's worth it if you can get them cheap enough but I would consider not using the catted Y pipe if it has Mac cats on it, supposed to be rather restrictive.
I would also consider porting the openings on the Macs for even better performance.
Macs are good LS1 headers and are somewhat under rated.
I would also consider porting the openings on the Macs for even better performance.
Macs are good LS1 headers and are somewhat under rated.
If the price is right, get them! On a basically stock car, you will see very similar gains to LTs, but as always, the difference will increase if you do a big cam and such.
They are really nice headers!
-Todd
They are really nice headers!
-Todd
I just finished a v6 to v8 swap, and dyno'd the car at TEA this past weekend.
It's a used LS1 (85K miles), TEA 5.7 Stage 1.5 heads, 224/228/115lsa cam, LS6 intake, HS rockers. And a used set of MAC headers and y-pipe I picked up for $250.
392 hp.
That's with an automatic, a blower cam running na, and no timing tweaks yet.
The MAC's worked out well for me. I can't complain...
It's a used LS1 (85K miles), TEA 5.7 Stage 1.5 heads, 224/228/115lsa cam, LS6 intake, HS rockers. And a used set of MAC headers and y-pipe I picked up for $250.
392 hp.
That's with an automatic, a blower cam running na, and no timing tweaks yet.
The MAC's worked out well for me. I can't complain...
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TECH Fanatic
Joined: Oct 2002
Posts: 1,068
Likes: 0
From: Seattle,Wa.
I recently had a set of Mac mid length with Mac cats installed and picked up 12 RWHP. I picked up a bunch of torque at lower RPMs also. This is without a tune. I'm happy with them and they sound good.
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im using macs right now on my 2000 bird and i love em yeah stay away from the catted pipe it is quite restrictive but also i goit mine for inspection and i got the mids for ground clearance i sit kinn alow but they are very good headers
Teching In
Joined: Apr 2004
Posts: 13
Likes: 0
From: Baltimore
Restrictive cats How do you all know that MAC's have restrictive cats, especially since all of your cars seem to have ORY's ? Also, does anyone have MACs with the catted Y and have NO banging problems. What fixes did you use, if any?
Thanks!
Thanks!
Originally Posted by watercool5
How do you all know that MAC's have restrictive cats, especially since all of your cars seem to have ORY's ? Also, does anyone have MACs with the catted Y and have NO banging problems. What fixes did you use, if any?
Thanks!
Thanks!
Staging Lane
Joined: Aug 2004
Posts: 51
Likes: 0
From: Texas
I concur, MAC cats are of poor quality...we ran their catted H-pipe on a bud's '91 Mustang LX and they crapped out within about 10K mi.
If you must need them for Smog reasons, Carsound converters work well and are inexpensive. $60 shipped from ebay.
If you must need them for Smog reasons, Carsound converters work well and are inexpensive. $60 shipped from ebay.
