DG and K&N
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I own a 83 atc with dg pipe/silencer. I paid about 200.00 for the combo and around 30 bucks for the k&n filter no airbox. It worked out ok, just 1 thing to be ready for if u buy the pipe it may leak exaust because they don't fit as well as the stock pipe so I had to seal it up and it was fine. Oh and had to get new springs the stock 1's where to long. You will notice a little bit difference, but not much. hope that help