GXP or Impala SS
LOL, yeah they are, after I had one as a rental I looked it up. Never noticed when you do the passing glance but when you get them side by side or look at the specs, there are definitely a few added on inches!
Staging Lane
Joined: Nov 2010
Posts: 85
Likes: 0
From: Carol Stream, IL
All in how you drive it. And even so, 100% worth it IMO. I don't want to slander our fellow LS4 brethren, but let's be honest, the GXP has better suspension, better brakes, HUD, Tapshift, and a lot more details that set it apart from their "normal" GP cousins. All in all, it comes down to preference but I wouldn't trade my GXP for anything 
TECH Enthusiast
Joined: Jul 2008
Posts: 703
Likes: 0
From: Atlanta Georgia USA
This is not because I have the MC but I'm very neutral on this I say it doesn't matter! But one thing if you made me contrast I would say that the GXP does have the cool TAP shift. I dunno dude just get a MC and cancel out both of them! LoL!!
TECH Enthusiast
Joined: May 2011
Posts: 640
Likes: 1
May have to do with driving habits... ~64k miles, 2nd set of front pads, original in back, 2nd Battery (Optima), 4th set of tires, but I drive it VERY hard, also depends which tires you get. Second trans, but that's a known issue. Everything else is original.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Depends on your driving style. Setting aside style and if we are talking stock vs. stock then.. If you drive hard, then no question GXP... If you drive sane - Impala SS... Or do what I did and get a SS on the cheap and mod the crap out of it! 
Gxp is much sportier. Better brakes, suspension and wider tires upfront. So it will handle better. Plus hud and tapshift. However, i would not get an ls4 if you want to mod it at all. They are a complete waste of money. However if you want to just have a good highway cruiser that is pretty quick then its not bad. And highway gas milage is pretty good.
Launching!
Joined: Jun 2009
Posts: 299
Likes: 1
From: The Woodlands,Texas/New Orleans
I like the Impala SS but i would get the GXP,looks more sportier you can get away with riding the stock rims on the GXP for a long time im currently looking for a 06-07 Monte Carlo SS but if i can find a GXP for a great price i'll sell my GTP Comp G asap
On The Tree
Joined: Nov 2010
Posts: 149
Likes: 0
Hear is my 2 pennies. I have drove a Impala SS and own a GXP. Not going into looks yet but the overall feel of the GXP if you are a 'Spirited' driver is the way to go. Everything they did does work. Suspension breaks tire combo etc. Tap shift is fun and functional. Nice to hold a gearl before going into a corner and not having to reach to manually shift or waiting for a downshift. Just wish it would rev match on downshifts haha. Interior, I guess i got jipped mine has neither NAV or 6 disc, WTH. I love the interior because it is more driver focusd. HUD - 2nd car with it, love it. IM 6 2 and fit great. THis is my fourth grandprix, 3rd this body style, first v8. My trans acted goofy a few times dropped pan all good.
My vote is GXP!
RedHOTG8 you crack me up. I would get one if I could afford it but want to buy another house next year.
TBSS - I had a regular trailblazer but i can only assume this would be the same, the driver seat did not go back far enough for my legs and I always felt cramped. Traded and got a GXP. It was the only time I had a halfway smart trade, different story.
Maintenance. Im on my 2nd set of fronts, first set of rears. NO brakes yet. I drive hard.
My vote is GXP!
RedHOTG8 you crack me up. I would get one if I could afford it but want to buy another house next year.
TBSS - I had a regular trailblazer but i can only assume this would be the same, the driver seat did not go back far enough for my legs and I always felt cramped. Traded and got a GXP. It was the only time I had a halfway smart trade, different story.
Maintenance. Im on my 2nd set of fronts, first set of rears. NO brakes yet. I drive hard.
