italiandude09 Posted July 31, 2007 Share Posted July 31, 2007 I know that on the Bmw 3 series there is a way to open a valve under the exhaust to make it louder at low RPM's and at idle. I realized that the IS 250 has ABSOLUTELY NO SOUND that comes out of the exhaust [just wind].. is there anyway to create more sound other than installing a new exhaust system? any small mods? thanks... Quote Link to comment Share on other sites More sharing options...
CrunchySkippy Posted July 31, 2007 Share Posted July 31, 2007 I know that on the Bmw 3 series there is a way to open a valve under the exhaust to make it louder at low RPM's and at idle. Unfortunately, I'm not aware of any such feature on the IS (nor have I read about one). But if its not too far off topic, can you tell me more about the BMW feature? It sounds like you're describing an exhaust "cut-out". I didn't know BMW's had this either. Is it a stock feature or possibly an aftermarket add-on? Lastly, is it located before the muffler or on the muffler? I will say that cut-out's are typically absurdly loud (and at all RPM's, not just idle), so perhaps what you're referring to is some sort of resonator for certain frequencies. Kind of makes me think of the soup can mufflers (except I haven't seen one on any BMW's...not that it hasn't been done!). Quote Link to comment Share on other sites More sharing options...
italiandude09 Posted July 31, 2007 Author Share Posted July 31, 2007 I know that on the Bmw 3 series there is a way to open a valve under the exhaust to make it louder at low RPM's and at idle. Unfortunately, I'm not aware of any such feature on the IS (nor have I read about one). But if its not too far off topic, can you tell me more about the BMW feature? It sounds like you're describing an exhaust "cut-out". I didn't know BMW's had this either. Is it a stock feature or possibly an aftermarket add-on? Lastly, is it located before the muffler or on the muffler? I will say that cut-out's are typically absurdly loud (and at all RPM's, not just idle), so perhaps what you're referring to is some sort of resonator for certain frequencies. Kind of makes me think of the soup can mufflers (except I haven't seen one on any BMW's...not that it hasn't been done!). Man im not sure if i am explaining it to you right, since my friend has the 335 with the sports package... What he told me is that it has something to do with the muffler, and how a valve was closed at idle and at low rpms by unplugging the valve [something like that] it is always open therefore creates more noise... Quote Link to comment Share on other sites More sharing options...
Bluey Posted August 2, 2007 Share Posted August 2, 2007 Man im not sure if i am explaining it to you right, since my friend has the 335 with the sports package... What he told me is that it has something to do with the muffler, and how a valve was closed at idle and at low rpms by unplugging the valve [something like that] it is always open therefore creates more noise... I had a Subaru Liberty (Legacy) twin turbo that had an automatic muffler flap that kept some back pressure at low RPM but opened for full breathing when pushed to the second turbo. This was supposed to help reduce the power dip that occured between the change to the second larger turbo at higher revs. I haven't heard what BMW have done with their 335 Quote Link to comment Share on other sites More sharing options...
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