It had nothing to do with the heads on the '99 and the problem was pretty much overblown. The '99's wound up putting down an average of around 265 to 270 rwhp but the press and some others got a hold of several that were down around 255 to 260 rwhp and they jumped on Ford for overrating the car. Ford responded with an acid dipped/extrude honed upper intake and a little more open cat-back which got the low-ballers up to average. In reality, the low numbers that I saw for the car was around 250 rwhp but there were dozens that put down 280 to
285 rwhp in completely stock trim
*before* the Ford upgrade so the average wound up where it was supposed to be anyway.
In a day when the F-body was basically getting the Corvette LS1 untouched and was way underrated, it was a decent move. However, having owned one and seen a ton of work and dynos on '99 DOHC there was really nothing at all with them at all. It was just marketing. Dan
2003 Cobra convertible With some stuff and things