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Very minimal
If you are driving with the top down you will faintly hear the turbo's. If you have the top up or hardtop you will practically not hear it (period).
Which is the way I want it too. The boxster 2.5 tends to have a whine by itself (stock).
Especially in traffic (slow speeds) I don't think you will notice anything.
One extra sound which I have noticed was a slight whirl wind like sound coming from the air intake (left side). This happens when you let go off the throttle.
I didn't install any blow off valve. The kit doesn't come with one (although it seems really easy to install). Plus I think once people hear that it will be a dead give away that the car is "charged".
I like it being a sleeper.
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'98 Porsche Boxster 2.5 non US Spec
Mods: B&M short shifter, new shifter, new handbrake, new steeringwheel. K&N element filter. Zimmerman cross drilled rotors. Pagid Blue brack pads.
Ruf front bumper. Aftermarket side skirts.
Ruf 18" wheels with Michelin PS2s premounted and balanced.
Turbowerx Twin Turbo kit (self installed)
Ruf lowering springs.
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