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Depends where the governor is set. Unless you have a tune your car will stop at some spot short of 140. I'm thinking 115 but I just pulled that out of my ass.
 

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Also I was stock then! But since that night I only dropped in a box k&n filter and notice a few good things! Better gas milage when criusing and better acceleration when on the go! Try it! Its recomended!
 

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I know the GTP (which is now the GXP) had the governor set at 115, can't remember what year. But they might've raised it for the GXP. I know it can top out at 140 or more with the GXP, it's just that Pontiac sets the governor somewhere south of 140 so that you can't go faster than that, unless you have a tune with cancels out the governor.

I also put in a K&N filter and the difference is night and day especially when accelerating from a stop. Never personally got it up to 130 (05 GT governor set at 135), cause not enough room on the road for me to get that much speed.
 

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there good year eagle ls2 tires stock from the factory
They are "T" tire rating which means that the tire is only good up to about 118. Most likely your governor is about 115. It's sad that Pontiac would skimp by putting $99 tires on a $28,000 vehicle.

It also got shitty reviews. Stupid link won't work. Go to Tirerack and you should find your tire and its "glowing" review.
 

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Some say the 05 GT's get up to 135 before cutting off, weird. And no I don't plan on figuring it out for myself.
 

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Me personally no. I only got it to 115 before pulling up when some dick was tailgating me on I-81...mostly because my fiancee didn't want any part of it. :p
 

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Ok.. so i wish my car topped out at 135 or anything other than 110. :(.

my 07' G6 Base (3.5L V6) tops out at 110. :( and same thing like someone else said. I hit 3rd, at around 104 and then when it shifts to 4th, i get 6mph more.. then thats it.. thats stupid..


(and yes. i found out on US 24 :D, runs right through the center of my town.)
 

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Somewhere between 115 and 120 for me. I hit this all of the time normally in 5th gear. Wish I could go faster because it sounds like the engine wants more.
You know you could get a tune that would take out that pesky governor right? Contact Chris at whiteautoandmedia.com or something to that effect. He has the only proven way to get rid of the governor and improve shifting along with other goodies.
 
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