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Old Dec 13, 2006 | 07:52 PM
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just got my kooks headers and cats installed and i notice when i take off, even at half throttle i can feel like they are rubbing the ground. any ideas or anyone else ever have this problem? thanks...02 z28
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Old Dec 13, 2006 | 07:57 PM
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Rubbing the ground? Do you have sportlines?
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Old Dec 13, 2006 | 08:15 PM
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my guess is either your headers or y-pipe are banging something, either the k-member or the underside of the body. when u accelerate, the motor twists and thus, the headers/y-pipe rub on the other components underneath. its very common after a header/y-pipe swap. what y pipe are u running?
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Old Dec 13, 2006 | 08:20 PM
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Originally Posted by Raise
my guess is either your headers or y-pipe are banging something, either the k-member or the underside of the body. when u accelerate, the motor twists and thus, the headers/y-pipe rub on the other components underneath. its very common after a header/y-pipe swap. what y pipe are u running?
Yep, there are a few fixes for this, i'd probably go with the rubber hose and band clamp mod.
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Old Dec 13, 2006 | 10:09 PM
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I assure you, unless you forgot to install your springs on your car, the headers are not rubbing on the ground. What you are feeling is the y-pipe contacting the floor board (as already eluded to). There are a couple fixes: get poly motor mounts, or do some massaging of the y-pipe (it can be bent a little out of the way).
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Old Dec 14, 2006 | 08:48 AM
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yeah did you do poly mounts? that can help lots.
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Old Dec 14, 2006 | 08:57 AM
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Run a search for "ypipe banging" for information research and you should get lots of results...
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Old Dec 14, 2006 | 02:28 PM
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Do you have Kooks Y-pipe as well? I don't have any banging whatsoever with mine and I still have the stock motor mounts. Do a search for a Mufflex bump stop. You could also use some old heater hose/clamp as stated for the short term to put between the Y and the floorboard.
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Old Dec 14, 2006 | 06:05 PM
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That sounds like your y pipe or cat hitting the floor boards. Did you buy kooks catted y setup? I did not need any poly motor mounts with mine. They fit perfectly like they came with the car from the factory. KOOKS = GREAT HEADERS
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Old Dec 14, 2006 | 07:18 PM
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My Kooks 3" --> 4" y-pipe touched the floorboard slightly, but I run poly mounts, which boosts the motor up a bit. I had to put a little more "crush" into mine for it to clear the floorboard on the bend in the top right corner of this pic. Just before it starts to go left, perpendicular to the 4" section....

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Old Dec 14, 2006 | 11:24 PM
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I just had mine installed today and I’m experiencing the same thing. I’m not feeling any banging like I had with my Mac setup on my last car but more of a vibration and rubbing and idle and take off.

I have the kooks 1 7/8 with Kooks offroad (offroad will be replaced with kooks cat'd/Y when they arrive, wrong y was ordered)
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Old Dec 15, 2006 | 11:56 AM
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i have a o1 z28 auto im looking into geting some headers i want the best and i want to have the cutouts in the y-pipe. I think i can getway without runing cats, my friend can get it inspected. What about taking off the air **** what will it do
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Old Dec 15, 2006 | 03:15 PM
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Well, i ordered my poly motor mounts and will have them installed next week. I will let you know if this helps but i have to try something....headers are rubbing really bad and its starting to drive me crazy. I'm getting about 70% positive feedback that this should do the trick (was told my stock bushing were collapsed so I hope it works
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Old Dec 15, 2006 | 03:24 PM
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My Kooks catted-Y hits the drivers side floor board frame slightly only when I nail it from a 10+ MPH roll, it almost sounds like a high RPM miss but it's not. At idle there is about 1 inch of clearance between the Y-pipe and frame. It was worse when I had first put it on a few weeks ago at about a 1/2 inch clearance. I adjusted the y pipe a few times and it went away except for the above mention condition. I think adjusting and/0r heating up the Y and bend it slightly at a muffler shop might cure your problem. Just my .02
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Old Dec 15, 2006 | 04:59 PM
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Yeah, HPE will attempt to adjust my Y pipe as well but right now I’m using one of there offroads until my cat-y comes in.

well let you know how it goes.....
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Old Dec 22, 2006 | 09:20 PM
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Well, I had HPE install new poly motor mounts today and they did the trick for my car. Car runs smooooth with no rubbing or banging anymore. Now i really love my kooks!!

Very happy kooks owner now!!
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Old Dec 23, 2006 | 01:05 AM
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thanks for the info..i also bought some poly motor and trans mounts..gonna get them in hopefully this week
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