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MAC midlengths?

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Old Mar 3, 2009 | 11:04 PM
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Default MAC midlengths?

How is the ground clearance with these? I am trying to decide what of headers I want to go with. I had pacesetter headers on my old 95 lt1 z28 and they were fine. I want to keep this car mild and I may lower it a little bit so I was looking at midlength headers. Does anyone have pictures of these installed?

Thanks in advance.
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Old Mar 3, 2009 | 11:23 PM
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dont waste your money. Just throw on a pair of 01-02 stock manifolds
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Old Mar 4, 2009 | 12:57 AM
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My MAC mids with cats had about an inch more clearance than the QTPs w/cats I later switched to. BTW, Except a little on the top end, I felt no difference between the two.

Re'
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Old Mar 4, 2009 | 11:00 PM
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mac's are good for lowered cars that would have clearance issues with LTs
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Old Mar 5, 2009 | 06:59 AM
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Does anyone have any dyno numbers? Surely they are better than shorties and manifolds.
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Old Mar 5, 2009 | 07:03 AM
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Yes, they will be better. But not much better than 01-02 manifolds. They actually flow pretty well. And they can be ported for even better flow.
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Old Mar 5, 2009 | 09:28 AM
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Thanks. Do any aftermarket companies make an ORY for stock manifolds? Not sure if I would go that route but it would be a cheap and easy option. I just haven't decided if I want to do LT's again. I definitely don't look forward to the install.

I found some Y pipe options. Would you recommend the SLP one pr is the Borla one worth an extra 100$.

Last edited by AR15 guy; Mar 5, 2009 at 09:44 AM.
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Old Mar 5, 2009 | 10:32 AM
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Originally Posted by AR15 guy
Thanks. Do any aftermarket companies make an ORY for stock manifolds? Not sure if I would go that route but it would be a cheap and easy option. I just haven't decided if I want to do LT's again. I definitely don't look forward to the install.

I found some Y pipe options. Would you recommend the SLP one pr is the Borla one worth an extra 100$.
Yes, I have one made by Mac. I got it off a sponsor on here summer of '07. Definitely made a difference in gas mileage but not sure about the power. My car is sort of a factory freak...
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Old Mar 5, 2009 | 11:06 AM
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Gas mileage is good also. This is my DD and I don't have any crazy plans for it. In the future I might but I will have to have a DD first. For now I will do basic bolt on mods. Like a lid, ORY, catback, underdrive pulley and ported TB.

I am going to have it tuned by a local guy as well.
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Old Mar 5, 2009 | 11:23 AM
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Originally Posted by AR15 guy
Gas mileage is good also. This is my DD and I don't have any crazy plans for it. In the future I might but I will have to have a DD first. For now I will do basic bolt on mods. Like a lid, ORY, catback, underdrive pulley and ported TB.

I am going to have it tuned by a local guy as well.
I'm right there with you. I'm pretty happy with my setup. Especially for not putting much money into it.
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Old Mar 5, 2009 | 11:49 AM
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MACs are a great street header. I picked up 18rwhp through the factory cats welded in the MAC Y-pipe (MAC cats are junk). The ground clearance is very good and the install was super-easy. I eventually replaced them with Hooker LTs when I went heads/cam, but would buy another set, preferable lightly used, for a street car.
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Old Mar 5, 2009 | 11:53 AM
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Originally Posted by redlineracing
dont waste your money. Just throw on a pair of 01-02 stock manifolds
Can't say that I agree with you. I gained plenty of HP and the weight difference is substantial. FWIW, GM went with the cast exhaust manifolds in 2000, the tubular ones are 1998-99 only.
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Old Mar 5, 2009 | 12:04 PM
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Originally Posted by redlineracing
Yes, they will be better. But not much better than 01-02 manifolds. They actually flow pretty well. And they can be ported for even better flow.


Lay off of the retard sandwiches buddy...
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Old Mar 5, 2009 | 01:41 PM
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there are guys on here lowered 1.8" and have longtubes... not sure which ones though but you might want to look into.
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Old Mar 5, 2009 | 03:58 PM
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MACs are OK.
I ran them for awhile..I made 360 RWHP with a stock longblock (01 LS6 cam) & an LS6 intake.

Unfortunatly,I can't seem to even give them away..They're just sitting in my garage collecting dust.
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Old Mar 5, 2009 | 04:10 PM
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check the "dyno" section. there are lots of guys making power with MAC mid lengths. on a 450rwhp H/C/I car the difference between MAC mid lengths and high quality long tubes is about 18rwhp or so from what i can find.
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Old Mar 5, 2009 | 05:06 PM
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mac and bassani make an ORY for stock exhaust mani's
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Old Mar 5, 2009 | 05:46 PM
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i've got mac's on my lowered ta, they came on mine otherwise i prolly would have went with LT's.

They're definetely not junk and the only clearance issues i have with is on tall speed bumps.
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Old Mar 5, 2009 | 06:03 PM
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Originally Posted by 99_Z28
Lay off of the retard sandwiches buddy...
what are you talking about?
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Old Mar 5, 2009 | 06:09 PM
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hey turbo time, interesting setup, any dyno numbers? also any more recent times run? that is a very similar setup to my car but i have an M6 so interesting to hear man
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