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Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-18-2008, 04:11 PM   #1
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Ok so the GXP rotors are 12.72" correct? then why is it that every website I go to has several different choices but only one is the correct size? for instance http://www.partsamerica.com/ProductD...pe=221&PTSet=A
says its for the gxp but when you check the size it isnt correct!
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Old 02-18-2008, 04:46 PM   #2
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Take a look at this
http://www.rockauto.com/catalog/x,ca...,parttype,1896

It looks like the rear rotor is(11.72" / 5 Bolt Holes / Vented}
Rear; GXP)
and the fronts are
(RAYBESTOS Part # 580264 {PG Plus Outside Diameter 12.715" / 5 Bolt Holes / Solid} Front; GXP)
I think the front rotor is also vented, that should be a typo on RockAuto'* part. Take a look at the pic.

ROD
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Old 02-18-2008, 04:49 PM   #3
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Thanx rrounds I never did stop to look at the fact that they were for the rear.
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Old 02-20-2008, 02:52 AM   #4
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Quick question. Do they make drilled or slotted rotors for this car?

I had 11.25" front rotors on my regal and got PowerStop drilled rotors for it, and the braking improvement was pretty big.
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Old 02-20-2008, 08:12 PM   #5
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I've not seen any personally so I cant say for either one, but I will say that no matter what type of rotor you get its gonna be expensive!
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Old 02-21-2008, 10:56 AM   #6
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So I read that the grand prix gxprotors are the same size in the front as the bonnie gxp (as far as diameter is concerned). So will the factory grand prix cross drilled rotors fit the bonneville?
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