does the stock exhaust have valves?
Driver
Joined: Nov 2014
Posts: 56
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From: Georgia
I don't believe the exhaust has valves ... JoeZ could probably tell us for sure. There is a valve on the intake box which is what you hear open up at higher RPM ... which also affects the exhaust note.
Lexus Champion
Joined: Oct 2005
Posts: 10,365
Likes: 2,764
From: Calgary, AB
It is the intake box that opens up at 3700 rpm. Only the intake induction sound changes as more noise is piped into the car after 3700 rpm. In Sport+ mode, the active sound control system augments some extra higher pitch frequencies at higher rpm.
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Joined: Nov 2004
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From: Under an IS F since 2008
Lexus Fanatic
iTrader: (10)
Joined: Nov 2004
Posts: 13,441
Likes: 1,080
From: Under an IS F since 2008
I don't know about having exhaust valves but ill tell you that when driving on the highway say cruising at about 60 or 70 the sound changes drastically when putting the power button on or off. In general it almost seems the engine or something opens up when PWR is on making it more free flowing. I have Headers and a Borla catback.
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Lexus Fanatic
iTrader: (10)
Joined: Nov 2004
Posts: 13,441
Likes: 1,080
From: Under an IS F since 2008
I don't know about having exhaust valves but ill tell you that when driving on the highway say cruising at about 60 or 70 the sound changes drastically when putting the power button on or off. In general it almost seems the engine or something opens up when PWR is on making it more free flowing. I have Headers and a Borla catback.
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