I'm still running stock gears, new gears will help, but still will not be as good as stock, even an inch will make it worse. With our 2.4L, our power band is in the high end of the RPM so 3k-4.5/5K range. Even if you get the same size tire, and MTR, it will be heaver and maybe a lil wider, That will still slow it down. If you plan on running off road and wouldn't mind making a small sacrifice get the same size tire but in MTR and re gear is a lil better gearing, then you should be OK on power.
Where not as lucky and the 2.5L guys and have low end power.
P.S. Don't forget the increase of gas mileage with bigger tires, the bigger the worse. I'm at 16 MPG with my set up. I have not changed the speedo gear, but its not off by much. The speedo is dead on with my 31's vs GPS speed. even checked it with radar too.