I will be going with the Ion I think, for one main reason. When coupled with their CAI all the factory black plastic crap is replaced. I like continuity and aesthetics and don't really want to pay extra for the MAF to Turbo pipe (Spool did say this was an option.) I do not like the fact that I will have to cut my car for the Ion though so I am torn. Spool hasn't offered any numbers yet, but their other stuff is reputable and quality built. Ion certainly has excelent customer service which is a big factor in my book. They always answer questions and are eager to provide assistance whenever they can, even when it is to me, someone who has not bought anything from them yet. I have not dealt with Spool except when I contacted them about their CAI several months ago and was told to check back in a few days, but they didn't release it until now. Since we haven't seen any specs on the Spool set up, it's hard to know if they made a custom fit IC core like Ion, or if they used an off the shelf unit. Spool does not use any 90 degree silicon hoses like Ion. But Ion really needs to get their website fixed!
So who knows? This didn't help much, but hopefully I provided some discussion material.
Britt