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Is this for a street or competition car? If for the street, forget about it. Sequential transaxles are dog engagement, which means that they are noisy and not very fun in stop and go traffic. The revs also have to be matched on the downshift. Remember, there are no synchro rings inside.
Porsche teams rarely used dog engagement transaxles in their racing cars until Alex Job debuted the Porsche/Holinger devised unit last year which became standard in the GT3RSR for 2004. One of the reasons is that at endurance races such as Daytona and Sebring, many teams would have a couple of "rented" drivers to go along with the paid hot-shoes. Many of the "gentlemen" drivers had little or no experience with dog engagement, and thus would learn the hard way by breaking things. The races are just too important to risk.
There are many companies out there manufacturing sequential transaxles. Hewland, Xtrac, Quaife, etc are just a few and they can cost less than 30K depending on the application. If you want to pay for the Porsche name on the side of the case, then I guess the price is accurate.
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