30 inches is the length that tunes the headers to shift the torque where i want it and it will end up putting the collector somewhere near the middle of what would be the cat so after the collector you just bend up a piece of 2.5" tubing and weld it to the collector and place the cat flange where it would normally be. Tuned length headers are not meant to just start and stop wherever there conveniently is a flange. I know many of you may not know this but you can make your own parts, thats how we do it for all the cars that don't have an aftermarket like this one, and this isn't my first rodeo in making headers.
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