RPM Extenders/chips

Bad idea to do that to a stock engine... They put those there for a reason. Your stock springs cant handle that much rpm...

Even with those mods, there probably won't be any need to have the rev limit above the factory 6250. With that cam, it's doubtful you'll see a power peak much above 5600 rpm. Nonetheless, there are other reasons to use a chip - idle speed adjustment will likely be necessary with that cam, and changing the timing curve will help a bunch. The only thing I'd recommend is to find someone to burn the chip for you where you can actually take your car to them. That way you can drive it a bit and make adjustments. Ideal situation is to have it done in conjuction with dyno runs and a/f ratio measurement. I wouldn't do a mail order chip.