Silicone IC couplers
#2
Their are oodles of places selling silicon couplers for turbo cars -- see www.turbohoses.com for example. However, for a stock car, I think the factory i/c connectors are the best available. They are a perfect fit, with grooves for the clamps, and are thick and sturdy. Aftermarket hoses also don't come in the extact sizes needed to transition from the intercooler to the intercooler pipes, so you have to end up stretching one that's a bit too small, or clamping down on one that's a big too big.
#6
I use the place below, they are local and I just drive over and get what I need
http://sporthoses.com/
http://sporthoses.com/