Installed Kooks 1-5/8" Headers - Mustang Evolution

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Old 05-23-2015, 07:41 PM   #1
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Installed Kooks 1-5/8" Headers

Wasn't planning on doing headers on my Mustang but I saw these on Amazon for $438. Kooks recently changed their part numbers so some one probably thought they discontinued these, marked them down for clearing out the warehouse. Still had to buy the mid-pipe though for $450, offroad X-pipe.

Started with the passenger side and tried to do it without lowering the K-member, I couldn't raise the engine high enough because of my Boss intake. Decided to buy an Engine Support Bar and lowered the K-member, so much easier. Had plenty of room after doing that, only took 6 hours after that.

The headers are definitely loud, off-road X pipe combined with Borla S-Types. Did feel a gain in torque, especially down low. Up top the engine likes not having the cats there. Not the huge 1-7/8" primaries since I don't plan on doing a supercharger, nor the 1-3/4" that people normally do for NA. If the math still supports it, the 302 with 1-5/8" primaries will do peak torque around 4800 RPM's. If the track doesn't get damaged from all the rain we have been getting the past month I should see some gain in trap speed.
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Old 05-23-2015, 08:21 PM   #2
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wow! nice find that is cheaper than I paid for my Pypes with a catted pipe

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Old 05-27-2015, 11:04 AM   #3
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Smart thinking on the small primaries for a daily driver car, really helps make the car feel snappier all else being equal. Back in the fox body 5.0 days, the stock headers 1.5" always felt the best for every day driving on a mildly modded car, a step up in larger primary size did not yield much power on those cars and felt softer down low.
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Old 05-27-2015, 11:20 AM   #4
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Quote:
Originally Posted by Nater View Post
Smart thinking on the small primaries for a daily driver car, really helps make the car feel snappier all else being equal. Back in the fox body 5.0 days, the stock headers 1.5" always felt the best for every day driving on a mildly modded car, a step up in larger primary size did not yield much power on those cars and felt softer down low.
Except that old school thinking doesn't apply to these newer cars. My ARH longtubes are 1 7/8 in size and I assure you they are not soft down low. My 1.5x 60' times are pretty good if you ask me.
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Old 05-27-2015, 12:02 PM   #5
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I know ARH headers have a longer primary length so that should help move the torque band to lower RPM's, while the shorter lengths will move it to the higher. Wouldn't think it would be a huge amount of power difference anyways, a bigger difference can be made up at the track by getting a better launch.


Definitely need to get a 1.5 sec 60' time, the people I race with can only cut 1.8 with drag radials and stall converters. Will hurt their feelings some.
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Old 05-27-2015, 10:13 PM   #6
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Quote:
Originally Posted by Grabber Blue5.0 View Post
Except that old school thinking doesn't apply to these newer cars. My ARH longtubes are 1 7/8 in size and I assure you they are not soft down low. My 1.5x 60' times are pretty good if you ask me.
I understand what your saying and by "soft" I dont mean that you wont be able to 60' well, etc. but you may lose some cylinder scavenge at low rpm and lighter loads which without drive by wire changes will make the car feel less responsive. I was not trying to say that lager primaries are not good in certain situations, it's just that people tend to run away from smaller primaries without good reasoning sometimes. Engine dynamics and air velocity is still in play on the "newer" cars, I know them well, I tune my 2014 TVS2300 car myself with HP Tuners, I would guess that not too many on this board do that.
Btw, your 60' times are very impressive, congrats on the combo that works well.
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