40th GT said:

Check your engine

egr delete and a bad mil, when something goes wrong with my car, i don't need an idiot light to tell me it's happening. it's been on for a year and a half.

Green Flea said:

I don't have 4:10's but Just by looking at that last picture (80 mph at 3,200rpm), It doesn't seem like theres any way you are going to get to 150 with just 3,000 rpm left to go. I'd say around 125 top speed plus or minus a few mph , but hey im just guessing.

brush up on your math junior.

http://www.corral.net/tech/
my 4th gear wraps to 110mph, how far more will a .68 overdrive gear go beyond that?

110mph @ 6000 RPM in 4th (1:1 ratio) = (?)mph @ 6000 in 5th (.68:1 ratio)

since 6000rpm is on both sides of the = sign we can cancel them out.

110 x 1 = .68 x (mph)

anything multiplied by 1 is always it's self, so we can take that from the equation.

110 = .68 x (mph)

and to solve, get the variable alone by dividing .68 from both sides.

110 / .68 = 161.7mph

my tires are 225/50/16 slightly smaller than stock and the 6000rpm speed isn't dead nuts 110 could be between 109-111, in any case the math is correct.