I am having a set of sidepipes made as we speak....should be done in a couple of weeks. Mine will be the first ones made for a Cobra and as yet don't have any test information to relate. Tues I will be having a DB test done, so we can compare between the old and the new...The new sidepipes have a spiral insert in them and will be able to change anything on the inside as ther is no welding required...The website for these pipes is....
WWW.spiralturbobaffles.com This insert was originally made for Corvettes and is now expanding to the Cobra. Anyone can also email me for additional info........