How fancy do you want it to look? I ask because I went to www.airflowonline.com and purchased a one foot section of 4" tubing and a 45 degree rubber elbow. I bought a 4-3" reducer hose from Lowe's and installed it on my stock MAF and 14" K&N filter. The tube matches the stock up-pipe almost perfectly so it looks factory. If you have a shorter filter you may need a longer tube to fit better. The total of the tube and elbow shipped plus the reducer hose was about $30. I have some pix I believe but I haven't developed them yet. It does look nice but I know that some people like chrome and stuff like that. I hope this helps.
