Is there much sounds difference after you do this modification. Me and a friend were going to try it on his car one night, but wanted to see how it would affect the car first. One more question.....Do you know what the vacuum valve actually does?
__________________ "When I cruise the streets you know that it's me
Split the crowd in half like Moses did to the sea"
ok heres what to do: get on your back and slide directly under the back of your car. look at the muffler. it should be on the muffler's left side. if you still cant find i dont know what to tell you, maybe your year/model didnt have it.
Originally posted by Import2ner@Sep 2 2003, 05:43 PM Is there much sounds difference after you do this modification. Me and a friend were going to try it on his car one night, but wanted to see how it would affect the car first. One more question.....Do you know what the vacuum valve actually does?
it actuates a flap when the car turns on that blocks off one of the tail pipes....if you look in the pipe you will be able to see it
i don't know if you should be plugging that. you may lose some torque in low rpm.
Originally posted by the mod This is another one of those little changes that does little to nothing. It basically adds a little more exhaust sound in the lower RPMs at light throttle.
if that does indeed control the flapper valve in the exhaust, i assume the "more exhaust sound" is because the valve is continually open. the valve is an exup valve, and the reason why bmw put it in is because they could run bigger headers without sacrificing low rpm torque (vavle=closed at low rpm).
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.