I have a procharger on my 2000 5.3 and have a kn filter on it now buy cant cross reference the numbers on it to replace it. Does anyone have a different filter part number on there procharger. It doesnt have to be a k&n but would prefer it. I have the filter right on the procharger head. It has to be fairly short cause of the brake booster

 

Take a look at K&N's website...

K&N Universal Round Tapered Cone Air Filters

 

Thanks man, I've already found the part numbers that would work. For what it's worth if anyone else is looking for one that will bolt to the back of the Procharger. I have on it now the ru-2590 which is the 4" flange and it works perfect for the 99-02 brake booster. But the exact size needs to be the 3.75" flange which is part # ru-3530