Upgrading Tire Size on Stock Suspension

I am currently running 245/75R16 on my stock wheels. I understand that I can run 265/75R16 on my vehicle which has stock components.

1) I am about to pull the trigger on some Terra Grapplers and want to be sure that there will be no modifications necessary with running this slightly larger tire? No spacers involved, shaving, etc?

2) I also understand that I might lose some power, take-off, acceleration and mpg. I am hoping since this is an all terrain type of tire that the above will be minimal. There were suggestions that I can switch up my air intake and exhaust to kind of compensate for any losses that I may experience. I know that I can regear but this seems to be the more expensive option, but perhaps more sensible.

If anyone can chime in on these two questions with your experience that'd be great!

Thanks in advance.

 

1. You'll have no issues
2. Any loss will be fairly minimal when only going up one size like that. Intakes and exhausts don't really help the mpg on these trucks at all. The stock intake is already drawing cold air from the fender well.

 

265-75-16 or 265-70-17 no problem with the gear??

 

dont bother regearing just going up one size, if you went to 35s then that would be a different story