Yes, they cost more than your typical Jap bike, find your local dealer and call them.
http://www.ktmusa.com/Dealer-Locator.77.20.html
Now for what that bike will cost you can get a killer mountain bike.

There is no real way to get it quiet with out affecting your performance…You might re-pack your silencer if that has not been done..But all and all they are noise-eee..If you start pluging things up the bike wont run right…..The exhaust on 2-strokes are tuned for the motor…If you change just say the silencer from stock to a short one.. with stock pipe…You could take a 1000 rpm's off the top rev….

Just ride your bike away from hippie..ville

The four strokes refer to intake, compression, combustion and exhaust strokes that occur in a four stroke engine.
1 Intake: the fuel and air are brought into the cylindar
2 Compression: the fuel-air mixture is compressed.
3 Combustion:this mixture is ignited by the spark plug to repel the cylindar back and thus giving the energy to drive the engine.
4 The Exhaust stroke: The resulting fumes are expelled on the cylindars return.

In a two stroke engine the strokes combine these mechanisms so that on all four of these can be combined into two strokes.

You may want to check this out too: http://science.howstuffworks.com/two-stroke1.htm

If it's that very smooth plastic, you'll have to sand it down, then paint over it with spraypaint made for plastics.
if you don't know what spraypaint this is, go to a local hardware store and ask of the workers.
if it's older and rough, make sure get it evened out.
either way,
-sand til you have a smooth sanded surface.
-paint with whatever is given to you by Mr. Home Depot or where ever, there'll probably be a primer and a few coats to make it look good.

It needs to go through a DMV inspection and the inspector will tell you what needs to be done, if anything, before it can be used on the roads It usually does not take that long.

It sounds like your first bike, Id get a 125 just to rag about abit and get the feel, then move up to a 250 when your ready for something abit heavier and faster!

It needs to be a 4 stroke, not 4 cylinder. The turn signals need to be a certain distance from the centerline of the bike. You probably can not take it on divided highways, I think it's a 250cc minimum. The lighting kits can be quite expensive if it doesn't already have the necessary lights, especially the tail-light and license bracket. If it came with the correct lighting then it is probably already titled as a street legal bike. You will just need a safety inspection and insurance.

Like your other " Question " , what make ?

I've looked all over, too, and we couldn't find any other than dirtwerkz. Maybe you could use it to and do a different color? It comes in both blue and tan, I think.

We actually didn't really like the dirtwerkz, so our baby ended up with Winnie the Pooh, but with some awesome Reed & McGrath Jumpers & PJs.

good luck!

Go to BBRMOTORSPORTS.COM and get a Powroll Thrust Chamber and you will get the performance of a aftermarket exhaust without spending 300 bones. Then get a rev box. It will let your motor rev past the stock limit witch will give you more hp. That is a good hp gain for under a 100 bones.

If you want to spend a little more money you can have the flywheel lightened at BBR for a hundred bucks. This will let you motor rev like a 2-stroke and make it pick up RPM's fast. If you do alot of wide open riding, this is the thing to do. "This will take away some of your bottom end."

If you still want more than get a big bore kit. If you do go with the big bore kit thin you will need to go with 26mm carb. The stock carb was not made to handle a bigger bore than stock.
P.S.- It is better to buy a complete kit than have the stock cyl. bore. Watch e-bay for these items and do not buy a china knock-off.