[Kevin]

The accordion will collapse matter what set up you have. You can check by watching it while you open the plates by hand. You will see it sick down. The coplan duct is no longer available, I know because I bought the last one from him at bg a few years ago. It's a stock looking duct with a an aluminum insert in it. Back in the day we also used a coffee can...but I can't remember the last time I saw a metal coffee can.

Before buying the duct from mark, I went through several factory ducts and due to the under hood heat they get soft and suck closed under acceleration. I remember thinking Keith's black car had bad injectors when we saw his dyno numbers, mr. Haibeck saw that his duct was collapsing. Mr. Haibeck sells hoops to keep this from happening.