If you're like me and probably the rest of us,the build is the fun part.
Although,I could have saved thousands by buying one already built.
You need to decide if you want a "drag only" quad or a fast quad you can still ride around on.
Drag quads are not for everybody.They can be very expensive.
Also,are your riding skills good enough for what you want.
Let's say you're use to a piped banshee,amd you want to build a 10 mil.That is a huge step up in performance.You might get yourself hurt if you're not careful.Take time and get use to it.
In drag racing,lighter is better.Horsepower is great but make sure the banshee can handle it.
Drag a-arms,lighter swingarm,marvin shaws,etc...are wonderful but can be expensive.
Setting a budget is important but I have no business telling ya that.I spent alot more this last build than I had planned.LOL!
Will you be racing dirt,sand,or asphault.In all of these,having the right tire and the right gearing makes a "huge" difference.Not having these right and vary depending on the track can make you lose races you should have won.