Hey Dean, Eric looked at your sketch and made these up from it.
http://www.classicchambered.com/clas...cts.html#cobraKidding, but he has them in stock at the bottom of that page as a reducer. We took and cut out just the transition we needed to match diameters and put it on the end like this
. We installed them in Dougs 3" and Karls 2.5". They make a really smooth radiused transition between the diameters so if the flutter is caused by reversion off the corners then this will fix it. Karls car will be running soon so we'll have some real feedback on whether it works. What was that about a lifetime beer supply................????????