here's my quick how-to add realistic chrome pipes to leader class optimus prime. I recently got a request for this tutorial from a member on this board, and thought I would share. On that note, I've also since this tutorial remade the pipes, cutting the top part on a 45 degree angle to resemble the movie prime's exhaust more accurately.
1. go to your local Rite-Aidpharmacy and buy this (chrome) makeup application set. It's made by mabeline and costs around $4.00, right in the makeup section.

2. break off the actuall brushes and stuff on the applicators. you need the tube.
Take a pencil or something light and make 2 small marks where you plan to cut the piping. Make sure the 2 pipes match in legnth now, or you'll be buying a second set.

3. rest an X- acto blade on your mark, pressing firmly (but keeping it straight) then roll the piping under your blade, causing a 'score' where you want the piping cut. roll it a few times until you hear light 'crunching noises'

4. grab some pliers or something to grasp the smaller end (not the part you will be using as the pipe, or you will hurt the finish)... with other hand, snap off you pipe. don't laugh at my poopy Ikea brand tools...

5. take the good part, and lay it's end onto some fine grit sandpaper. gently sand off any sharp edges. this also creates a nice buffed look for the edge.

6. cut about 3/4 off of the rubber pipes on leader Prime. Whatever's left over you need to shave down so these new pipes slide on tightly. I suggest trimming the rubber pipes so they are cone shaped. I left most of the base untouched, only trimmed a bunch off the tops. they need to be shaped like a pencil point.

7. Firmly slide your new pipes onto Optimus. Mine sit so tight, I won't even need glue.
Now, I have Nice shiny chrome exhaust pipes.