Can you put an exhaust brake on a stock, 05' cummins? Or do you need other mods to enable it to work correctly?

 

You can put one on a bone stock '05 without mods if it's a manual transmission. If it's an automatic, you'll need a separate transmission controller to lock the converter while braking. Some brands of exhaust brakes come with the controllers while some do not and have to be purchased separately.

 

Thanks man! What brand would you recommend?

 

Get yourself a Pac Brake PRXB, works better than the Jacobs and no vacuum pump to screw up. Comes with a compressor which works well if you ever get air bags.

 

Does it come with a controller or would I need to buy one?