Laptop proven 136mph. The speedo read near 150!!! eek Can you say some bad error after 100mph... That was several seconds into 5th gear.

At 40 it's on
At 65 it's off by 1
At 80 its 2
at 100 it's 3-4
by 120 it's like 8.
it' was over 10 at 150ish

Stock tire sizes.

2000 SVT #674 - Check it out!

Whoever coined the phrase; "If it ain't broke; don't fix it" ~ Just doesn't get it...