Impala SS Bilstein BMR ZZ GXP Suspension Upgrades Done!
Nice, although the sway bar would've made the biggest diffrence . I would highly recommend going coilover though. Best handling upgrade I've done with the car so far.
TECH Enthusiast
Joined: Dec 2012
Posts: 696
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From: WEST PALM BEACH FL
So i got the bmr rear stuff all done today and i noticed a huge difference cant wait to really drive it to get the real feel of everything.. how much did u pay for the bilstien coilovers? i wish i would of know of them before i spent a 1000 on struts but maybe i can sell them and do coilovers also your not the first one top say that and the car if stiff but still squats alot on an lanch
TECH Enthusiast
Joined: Oct 2013
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From: hagerstown,md
Hawkins04 - When I'm in the mood to drive hard the car shines with all the undercar mods. A blast! However when I just want to cruise, it would be nice to flip a switch and have it ride like a Buick. Guess I'm getting old. 
LoL. Regarding the brakes, after nearly 2 years of use the rotors are starting to show some wear and if I lay into the brakes hard from high speed I will notice some pulse in the brake pedal till the rotors cool off. Seems like the pads outlast the rotors in this application. At least that's my experience.
GXP25 - I never thought about it, but I can see how some in the GXP camp might see defiling GXP calipers like I did could be viewed as sacrilege. LoL.
LoL. Regarding the brakes, after nearly 2 years of use the rotors are starting to show some wear and if I lay into the brakes hard from high speed I will notice some pulse in the brake pedal till the rotors cool off. Seems like the pads outlast the rotors in this application. At least that's my experience.GXP25 - I never thought about it, but I can see how some in the GXP camp might see defiling GXP calipers like I did could be viewed as sacrilege. LoL.
TECH Enthusiast
Joined: Dec 2012
Posts: 696
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From: WEST PALM BEACH FL
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Very good write up. Excellent comparisons and good info for those looking into these parts. Thank you for doing this. If any one else has questions on these parts give us a call.
Teching In
Joined: Feb 2014
Posts: 17
Likes: 0
From: Milwaukee, WI
Just curious to anyone that has gone similar route with upgrading to the bilstein. I've taken the part numbers provided for the bilstein shocks and did a google search and every site that comes up there discontinued... What are people doing now for suspension upgrades cause it appears only options seem to be factory replacement stuff or kyb
TECH Enthusiast
Joined: Dec 2012
Posts: 696
Likes: 0
From: WEST PALM BEACH FL
Just curious to anyone that has gone similar route with upgrading to the bilstein. I've taken the part numbers provided for the bilstein shocks and did a google search and every site that comes up there discontinued... What are people doing now for suspension upgrades cause it appears only options seem to be factory replacement stuff or kyb
Teching In
Joined: Feb 2014
Posts: 17
Likes: 0
From: Milwaukee, WI
I went on there and entered in my 07 impala ss and only thing that came up was rear Bilstein struts part number for those was 35-153160 on there site
Just to be clear, there are three different models: B6 (C) Comfort, B6 (HD) Heavy Duty, and B8 (SP) Sport.
OEM GXP Bilsteins are tuned by GM and fit in between the B6 (C) Comfort and B6 (HD) Heavy Duty. I believe most people go for the HDs.
B6 (C) Comfort:
Front: 35-153375
Rear: 35-153382
B6 (HD) Heavy Duty:
Front: 35-153153
Rear: 35-153160
All can be found on Amazon and are pricey.
EDIT: I'll be going with the B6 (C) Comfort struts.
OEM GXP AC Delco part numbers:
Front: 505-548
Rear: 505-549
OEM Super AC Delco part numbers:
Front: 506-682
Rear: 506-664
OEM GXP Bilsteins are tuned by GM and fit in between the B6 (C) Comfort and B6 (HD) Heavy Duty. I believe most people go for the HDs.
B6 (C) Comfort:
Front: 35-153375
Rear: 35-153382
B6 (HD) Heavy Duty:
Front: 35-153153
Rear: 35-153160
All can be found on Amazon and are pricey.
EDIT: I'll be going with the B6 (C) Comfort struts.
OEM GXP AC Delco part numbers:
Front: 505-548
Rear: 505-549
OEM Super AC Delco part numbers:
Front: 506-682
Rear: 506-664
Last edited by GXP25; Sep 20, 2014 at 11:01 AM. Reason: Spelling and added some more info.
Teching In
Joined: Feb 2014
Posts: 17
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From: Milwaukee, WI
Is there any reason why fe4 struts from say a Grand Prix couldn't be used on my impala? See them on rockauto and look exactly like factory bilsteins that come in the gxp
Ac delco part numbers
Front part number 505548
Rear part number 505549
Ac delco part numbers
Front part number 505548
Rear part number 505549
Teching In
Joined: Apr 2010
Posts: 19
Likes: 0
From: NY
Looking at upgrading rear brakes on 06 monte ss with gxp setup and not sure how the parking brakes would work. Gxp rotors are shallow, monte ss rotors are thick to run parking shoes inside rotor.Will the gxp rotor work with stock parking brakes on monte ss? Any info would be helpful.
Last edited by Killerb; Apr 16, 2014 at 06:07 PM.
Teching In
Joined: Oct 2010
Posts: 17
Likes: 0
From: Lorette Manitoba
Gxp Brakes All I'm using from the GXP brake system are the: calipers, brackets, rotors, pads, and hoses. I'm uncertain if the GXP master cylinder or any other components are unique to the GXP system. Anyone out there know? I never swapped the brake pedal out either. I'm curious to know if the pedals are different between the 2 cars. Anyone know if the pedals have different part numbers? The GXP brakes work much better then the stock Impala brakes. Pedal feel is not the greatest. Not sure why. Could be due to not swapping the brake pedals out. I did thoroughly bleed the system. Pedal just isn't as firm or high as I'd like. But as stated above the brakes work great.
TECH Enthusiast
Joined: Dec 2012
Posts: 696
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From: WEST PALM BEACH FL
Yes the ss wheels clear perfect without spacers got them on my ss along with every other mod that 08 red ss has
TECH Enthusiast
Joined: Dec 2012
Posts: 696
Likes: 0
From: WEST PALM BEACH FL
Looking at upgrading rear brakes on 06 monte ss with gxp setup and not sure how the parking brakes would work. Gxp rotors are shallow, monte ss rotors are thick to run parking shoes inside rotor.Will the gxp rotor work with stock parking brakes on monte ss? Any info would be helpful.
