|
The main problem with aftermarket Boxster exhausts has always been a ghastly harmonic droning effect inside the car at typical highway speeds. Porsche sport exhausts for the 986 addressed the problem by adding small diameter muffler bypass pipes with some kind of vacuum-assisted valve opening mechanism. It avoids the drone, but is way expensive.
A while back, some folks were adding small bypass pipes to stock mufflers with some success, but you have to be pretty handy with a welder to do that, or know someone who is.
|