Does anyone know of a good company that produces jackets for racing? I am trying to find out which brands are used in MotoGP or AMA but I can't find them. Specifically I am looking for a jacket with a speed hump. If I have to go custom, are there any recommendations?

 

Holy **** man.......no need for custom. Joe Rocket/Alpinestar/Tecknic/Spidi/AGV/ among others all make perfectly fine race suits and yes, the AMA and MotoGP guys use all of those. Dianese are what you'll see on Rossi if you are wondering. Very expensive, but nice.
Look through here, there are plenty available. Get some good gloves and good boots too. Dont skimp on this. I recommend Sidi boots. Comfy as hell and top notch. I dont think they come any better than these.

 

Also check out KOMODO Leathers (http://www.komodogear.com/)

They seem to have a following in club racing circles.

If you want something for "racing" then you want a full suit. A 2-piece will be more versatile than a 1-piece since you can wear the jacket alone, or wear the suit and take off the jacket when you get to your destination on the street. For actuall racing or trackdays, nothing beats the protection of a 1-piece.

Joe Rocket and Alpinestars are great brands to look at. I like Teknic and have a Speedstar 1-piece.

Joe Rocket has the "Honda" replica jackets. They are pretty sweet. You can even buy a replica Duhamel/Zemke suit from them.