Im in the same boat. Got to the point were I was wondering if it was worth all this driving around town and buying stuff only to have to return it. My next thought is to order the Spectre 4" diameter 45 degree mandrel along with a 4" to 3.5" and a 4" to 4" rubber coupler and I might get the 4"-4" straight tube. If this doesn't work I am going to look for that CAI on ebay that they talked about in another forum. Sorry dont have the link right now and Im not sure where I saw it.

Parts List from O'Reilly Auto Part Store:

1) 4" 45 deg. Mandrel- Part # 9749 Speed by Spectre 9749 - Elbow | O'Reilly Auto Parts
2) 4"- 3.5" Rubber Coupler- Part # 9742 Speed by Spectre 9742 - Air Intake Coupler/Reducer Combo | O'Reilly Auto Parts
3) 4"-4" Rubber Coupler- Part # 9772 Speed by Spectre 9772 - Air Intake Coupler/Reducer Combo | O'Reilly Auto Parts
and maybe the 4" by 4" straigh tube because I want my filter to extend to the open slot in the corner.
4) 4"- 4" staight tube- Part # 9709 Speed by Spectre 9709 - Straight Tube | O'Reilly Auto Parts

Hope this helps!!