i know allen used these and i know a few others did as well. but i was wondering what size hoses i needed to use for the intake. i'm in tallahassee at college and my truck is in pensacola so i can't just go measure everything. i'm almost positive i need 4" hose but everyone else has been telling me 3.5" to make sure it fits snug. i don't want to order hose and then have it not fit and have to order and wait for more. i really don't think that this stuff is going to stretch that much to merrit 3.5" hose. what have you guys used? i'm planning on getting everything from air flow systems