The concept remains the same as a car I would think, however there is a mixed back of folks on the forum who feel the bolt ons don't really do much, and some that feel they do.
Some have done Xpipe and Exhaust.
Some if done intake, Xpipe and Exhaust
Some have done just pipes.
One member has done headers and pipes (that I can recall)
All of the above may help with performance, but overall would only likely eek out a small to a little larger than small number of HP/TQ.
Now, there is a gentleman on here who has done (I believe), headwork and new cam (possible tune?), and he saw some very tasty gains. Like up to or over 100hp total!
Some have also done the Booster Plug to help richen the fuel for low speed throttle control and remove exhaust farting on deceleration, and a couple have done belt drive conversion which also smoothed out the power delivery some.
Other than some serious work like Pasta has noted, all the bolt ons will only get you so far. Still enjoyable to do them and I feel they do add a little more motor performance.