Originally Posted by ebelen1

I have a '99 runner and since I got it five months ago, I've done a ton of mods and can't figure out if one or some have contributed to loss of power on the freeway. When it was stock w/ 15" wheels, the prior owner said he could cruise at 90 mph on the freeway.

Since I've gotten it, I've put 16x8 wheels w/ 265/75/16 tires, and a 3-inch lift. I have not upgraded the gears, and have installed a K&N FIPK and a magnaflow muffler. Both these mods gave me faster throttle response vs. stock. When I'm on the freeway, I can go 90 mph if the freeway is level but as soon as it hits an upward slope, the truck just slows down. I've even opened her up but nothing but louder noise at the same speed. I know that the rims and tires with the lift will kill some top-end but is this normal? I've also done full blown maintenance on the truck (smoother shifting for the tranny and more throttle response at low-ends), but nothing to improve the top-end.

I'm not supporting speeding over the limit but just want to know if this is normal for all the other 3rd gens out there. Any thoughts?