You're probably thinking about a K&N StubStack of which several varieties were made. I've still got some on the shelf that are used for dyno testing on occasion. Another company making stub stacks is R2C Performance products and I currently run one of those on my Ford Y-Block powered altered. Definitely does the job on a vacuum secondary carb as the altered runs 8.90's and 146-147 mph in the quarter. Ted Eaton.
Ted Eaton www.eatonbalancing.com
Fe's are a thrill a second when they run mid eights but Y-Blocks are just plain fun when they run 8.80's at 145mph in the quarter using a vacuum secondary carb.