:lol :lol lolI know I'm gonna get crucified for this, but......
How long have you been riding? Is this your first bike?
Is this the first time on a 750cc? Did you move up to it?
My suggestion is learn to ride the ZX7 with what it already has...it has more than any normal person will need in the realm of power and speed. Learn to ride the bike as is, before you try to make it go faster, faster, faster.
Just my $.02 based on the limited info provided.
I agree they are fast enough for streets thats why I didnt buy a bigger bike I didn't feel I needed it. You will require steel balls to take it top speed on the highway.If you want more speed, you sell it and buy a ZX10.
No modification can make a ZX7R as fast as a ZX10 for the same money, assuming you are buying used bikes in either case. No matter what anyone likes to say, you can buy a 10R for what? Like 5-6 gfor an 04/05 used?
You would be better served simply maintaining your 7. They are fast enough as it is, and I doubt you can outride the bike anyways. Focus on making sure it is mechanically sound and safe and you will have a fun, reliable motorcycle.