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LS4 Performance Grand Prix GXP | Monte Carlo SS | Impala SS | LaCrosse Super

GXP or Impala SS

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Old Jun 20, 2011 | 08:09 PM
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Default GXP or Impala SS
OK, between the 2 either a better choice?
What are the known/common problems, I see tranny, n A/C stuff posted on a lot.
DOD taken out in the tune?That usually solve the oil consumption?
What are the usual mods, Cai, down pipe, resonator delete, mufflers, tune?

Been looking at them and just trying to get a general idea of what to look for.
Any year better than the others?

Thanks for any and all info
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Old Jun 20, 2011 | 08:21 PM
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Originally Posted by Blackbird89
OK, between the 2 either a better choice?
What are the known/common problems, I see tranny, n A/C stuff posted on a lot.
DOD taken out in the tune?That usually solve the oil consumption?
What are the usual mods, Cai, down pipe, resonator delete, mufflers, tune?

Been looking at them and just trying to get a general idea of what to look for.
Any year better than the others?

Thanks for any and all info
the powertrain and the performance mods are all going to be the same regardless of gxp vs. impala SS.....I personally would recommend the GXP as the Impala is the most bland of all the LS4 w-bodies and blends in completely with every other fleet impala out there....and IMHO, the newer the better so you have more powertrain warranty
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Old Jun 20, 2011 | 08:38 PM
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pontiac. Built for performance
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Old Jun 20, 2011 | 09:03 PM
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Get an 05-06(GXP)or 06(MCSS or IMPSS) so you can get a custom Lew tune,07-09 are not supprted.I have an Impala,but would say go to the GXP wider is better right?

GXP=You get HUD,drilled rotors,sweet rims(stock),etc...

SS=you get a chevy

If I were to do it over again i would have went GXP,but then again my Impala blends in with every other fleet ride(Just w/more *****)
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Old Jun 20, 2011 | 09:03 PM
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GXP The Impala is boring in comparison. Just look at the interior and you'll see what I mean.
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Old Jun 20, 2011 | 09:04 PM
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Originally Posted by int_53185
GXP The Impala is boring in comparison. Just look at the interior and you'll see what I mean.
Pontiac looks cheap
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Old Jun 20, 2011 | 09:10 PM
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I do like the looks of both.Guess driving both would help.
What's realistic mpg , drive 25 miles one way to work, 80% highway.
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Old Jun 20, 2011 | 09:26 PM
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Im all city driving,i drive about 10 miles a day to work,pick up kids,and go home i get 12.4 mpg maybe worse
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Old Jun 20, 2011 | 09:30 PM
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i have been getting around 20-23 city/highway if i stay on the highway i could get 26 probably
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Old Jun 20, 2011 | 09:35 PM
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Originally Posted by xxtheshockerxx
i have been getting around 20-23 city/highway if i stay on the highway i could get 26 probably
I get about the same when I drive the Impala. Best I got on a road trip was 28mpg but that was ALL highway with the cruise set at 75.


Op- Really you just need to make up your own mind on which car you want. It's well know that even though these cars are very similar secretly most don't like each other.

I'm not going to bash the GXP and say **** about it cause I don't own one, I've got an Impala and love my car. Are there things I would change about it, YES, but I've been doing that slowly.

All cars are "cookie cutter" cars until you make it your own.
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Old Jun 20, 2011 | 09:41 PM
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TapShift.

Why not a LaCrosse Super? Shares Bilsteins with the GXP and it's classy. Impalas are by far the highest produced LS4 car, by over 30,000 I believe.

https://ls1tech.com/forums/ls4-perfo...n-numbers.html
Last edited by TheJPGXP; Jun 20, 2011 at 09:48 PM.
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Old Jun 20, 2011 | 09:50 PM
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I've never heard of a LaCrosse Super is probably why lol.
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Old Jun 20, 2011 | 10:19 PM
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Originally Posted by 1CL3ANSUP3RSPORT
,but then again my Impala blends in with every other fleet ride(Just w/more *****)
On the plus side, cars get out of the way on the interstate. They think every Impala is a cop.
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Old Jun 20, 2011 | 11:33 PM
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What about a G8
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Old Jun 20, 2011 | 11:53 PM
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Originally Posted by TheJPGXP
TapShift.

Why not a LaCrosse Super? Shares Bilsteins with the GXP and it's classy. Impalas are by far the highest produced LS4 car, by over 30,000 I believe.

https://ls1tech.com/forums/ls4-perfo...n-numbers.html
that is a good link
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Old Jun 20, 2011 | 11:54 PM
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Default Gxp
Would you like to buy my car? The engine and transmission is already built up. It only has one problem
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Old Jun 21, 2011 | 12:31 AM
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Originally Posted by 1CL3ANSUP3RSPORT
Get an 05-06(GXP)or 06(MCSS or IMPSS) so you can get a custom Lew tune,07-09 are not supprted.I have an Impala,but would say go to the GXP wider is better right?

GXP=You get HUD,drilled rotors,sweet rims(stock),etc...

SS=you get a chevy

If I were to do it over again i would have went GXP,but then again my Impala blends in with every other fleet ride(Just w/more *****)
Forgot about tap shift
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Old Jun 21, 2011 | 06:35 AM
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gxp look so much better than impala ss
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Old Jun 21, 2011 | 06:38 AM
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Gxp. .
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Old Jun 21, 2011 | 07:31 AM
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Originally Posted by xxtheshockerxx
that is a good link
I spent a lot of time on it and it just fell to the wayside.
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