..ok, might sound crazy...i've never had a PC/etc on any of my bikes...i often read a lot of posts about pcv maps, ivan's, etc...if someone were to ask ME about it, i would only be making shit up from various conversations i've read-lol!....i bought my 07 with a 4-2-1 header and roaring toyz short megaphone exhaust...no other major mods other than cosmetics....so, do you think a PC is necessary anytime you have an aftermarket exhaust?..why?

A map in a PCV is an adjustment to the factory map. Most of them are adding or removing small amounts of fuel here and there. I don't know about the Gen1s but the 2012+ have been shown to be safe with a pipe without one. Better with the the factory has it pretty rich up top.

No. Because you still run a restricted muffler. Most factory maps run safe rich so you would not need a pc. The 'pig' is more for performance/racing. More gas the bigger bang.

A map is like looking down at an empty chess or checkerboard table. Call that checkerboard a map. Call each square a cell. We have longitudinal and latitudinal lines, but on a flat 2-dimentional way of looking at a map and its locations.

A cell is like a square [wave] on that chessboard. Each number holds a fuel percentage as in an open/close time kind of way. The injector is held open for so long and then closes. That [number] waiting is at a preset. That's how to shoot fuel out of the injector is hold it open longer for rich. Close it fast for lean. The ECU sends that signal so you can capture it, spread out the open time [rich], close down the injector sooner and make it lean. Since it is 2-dimentional, we can use a row of cells to represent X rows. This represents an rpm speed broken down in increments so a cell holds that increment space and time.

We can use the Y column to rep the throttle's opening position. We can grid this row from 0 closing to 100% opening. We grid the rpm X columns in increments of 0 to 15,000 rpm are our crank speed breakdowns.

I turn the key on. That means my map knows this cell number is to be used upon start up. How does it know? We have 0 rpm at key on. We know where that cell is and how many rpms are in the cell until it idles past a certain rpm range in the breakdown of each cell and its rpm range. We have the throttle closed and that reps at 0 opening. This confirms the same cell as they intersect at idle. That's a factory map number sending out how much fuel to feed an engine, be it hot or cold or just starting up warm again.

Even thought that map has a number, it calcs off the other numbers coming in. So it changes via the air temp, the water temp warming up, how high/low in altitude was this started at? Lots of telemetry to calc out as to, how long that injector stays open?

The pc processor can mimic the same exact signal the ECU can for fueling. That's called zero cells filled in the map. There are no signals to change so the signal passes right thru the pc and onto the injector. The pc computer can replace the signal and now holds the open/closing time of the injector. It now can spray a different fuel to air ratio.

If it is preset at the factory to run at best performance, best economy, the pc can chase for the best performance. The pc can spray less volume of fuel and lean out the bike for best economy. All you are doing is controlling the air to fuel ratio by a number in a cell grid. This is basically how a 'base map' works.