07 Grand Prix GXP
Staging Lane
Joined: Apr 2014
Posts: 68
Likes: 0
From: Illinois/Wisconsin
I'm not totally sure about the LS4s, but newer AFM vehicles use the backpressure from the resonator to keep V4 mode running longer... So do with that information what you will.
But having an early-build 2007 without a sunroof is kinda the best GXP to have (in my opinion). It's the newest one that has the real Alcoa wheels, the lack of sunroof keeps the center of gravity lower and reduces overall weight, optimizing performance. Also, from a philosophical standpoint, when that car was new, it was the highest-performing showroom Pontiac available (GTO ended in 2006, and G8 didn't show up until 2008).
Enjoy your wonderful Unicorn! (I'm a little jealous)
But having an early-build 2007 without a sunroof is kinda the best GXP to have (in my opinion). It's the newest one that has the real Alcoa wheels, the lack of sunroof keeps the center of gravity lower and reduces overall weight, optimizing performance. Also, from a philosophical standpoint, when that car was new, it was the highest-performing showroom Pontiac available (GTO ended in 2006, and G8 didn't show up until 2008).
Enjoy your wonderful Unicorn! (I'm a little jealous)
Thread Starter
Teching In
Joined: Jan 2015
Posts: 12
Likes: 0
I'm not totally sure about the LS4s, but newer AFM vehicles use the backpressure from the resonator to keep V4 mode running longer... So do with that information what you will.
But having an early-build 2007 without a sunroof is kinda the best GXP to have (in my opinion). It's the newest one that has the real Alcoa wheels, the lack of sunroof keeps the center of gravity lower and reduces overall weight, optimizing performance. Also, from a philosophical standpoint, when that car was new, it was the highest-performing showroom Pontiac available (GTO ended in 2006, and G8 didn't show up until 2008).
Enjoy your wonderful Unicorn! (I'm a little jealous)
But having an early-build 2007 without a sunroof is kinda the best GXP to have (in my opinion). It's the newest one that has the real Alcoa wheels, the lack of sunroof keeps the center of gravity lower and reduces overall weight, optimizing performance. Also, from a philosophical standpoint, when that car was new, it was the highest-performing showroom Pontiac available (GTO ended in 2006, and G8 didn't show up until 2008).
Enjoy your wonderful Unicorn! (I'm a little jealous)
Thread Starter
Teching In
Joined: Jan 2015
Posts: 12
Likes: 0
Mufflers ._. Now, I decided to go with the Mandrel Exhaust cuz its pipes, so full flow, and all i need/want are mufflers. I'm assuming the mufflers affect the sound in a way. I want a deep throaty sound like magnaflow but I really like the Powerflow Exhaust from SLP ._.
the stock sound is amazing on its own, but the stock exhaust is restrictive :/
so..... what mufflers should I get ._.
the stock sound is amazing on its own, but the stock exhaust is restrictive :/
so..... what mufflers should I get ._.
