Either intake will work just fine. The TFS intake has more HP capability, but the Cobra isn't maxed out until around 400 or so. The 19#'ers will be fine as long as you have enough pump (255) and an AFPR. I got my Cobra because I found it used and it was a good deal. $300 for intake and FMS 65mm TB. They can be found used for great prices. The other good thing about the Cobra is that it has a built in EGR spacer, so that is money saved over the TFS intake.
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1991 Mustang GT - Cobra Intake, FMS 65mm TB, C&L 73mm MAF, GT-40P heads, Crane 2031 cam, Crane 1.7rr, Built AOD, Art Carr 2400 non-lockup converter, Transgo shift kit, BBK chrome cold air, FMS 'P' headers, Pacesetter off-road H, BBK aluminum pulleys, 2-C Flows w/ dumps, 4.10's, Steeda STB, for now...
The Original GT-40P Tech Page