You don't even need longtubes on these cars, not until you are making big power. Hell, even the terminator guys don't swap away from the factory manifolds until 600+hp, there is no need. The money spent on headers can be put to much better use somewhere else.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.