I'm looking for a silicone tubing that could step from 3.375 in. ID to 4.5 in. ID.

I've contacted a few places on the internet, but wanted to know if anyone knows of anywhere that makes this.

I'm trying to make a homemade intake for my Focus. I realized that it already has a PET (I assume) intake tube from the throttle body to the air box, so all I would need is a silicone tube, an air filter, and a couple hose clamps.

Help this poor FWD soul out.

ATR is an awsome place for these from what I've heard.

http://www.atrperformance.com/

I don't see then listed, but give them a call. They're awsome guys.

Yeah, I found a few places online that carry it, I just need to confirm my measurements and figure out if I can get something smaller in the silicone tubing and stretch it, or if I could get something larger and clamp it.

You gonna be at the autocross this weekend?