hi, a long time ago before i decided to get the TRD exhaust I was planning on getting a Greddy or HKS exhaust but worried about how loud it would get during my daily commute to school. I came upon a cut-off valve by Apex-i and was gonna get one except it was a manual valve and costed a pretty penny and decided to go with a TRD exhaust instead...

Anyways i havent thought about it for atleast a few years now unil i found these videos on youtube demonstrating an electronic automatic version and wondered if anyone actually has these at all?

http://youtube.com/watch?v=1uKmhx5INSU

http://youtube.com/watch?v=eMeJyR-KfGk

http://youtube.com/watch?v=6FqWAC68wkU


wow my next car im definitely getting one of these so i dont have to turn my music out to drown out the droning and at the same time keep the popo off my back

but i have a quetion wouldn't choking off the exhaust like that have an negative effect on the car?

question tho... if you didn't want a loud car to begin with, why even get a exhaust? the gains in performance are negliable. especially with the TRD one.

i dont think the cut-off valves are intended to decrease sound.

i remember someone telling me that with the cutoff did alter the sound a bit but now im not sure anymore...

and the reason i wanted one so i can change the sound when i feel like it. fully open when im in city or cruising around and slightly choked off to reduce the droning on my 1 hour commute.

but maybe i got this whole cutoff thing backwards and it doesn;t lower the tone but anyways thats the reason im hear asking u guys

it looks to me like it's before the muffler and when it's open it's like running with no muffler. it doesn't look like it's there to make anything quieter.

Well heres what i found and it says installed in the main pipe...


This is for the Exhaust Control Valve by Apex-i
http://www.apexi-usa.com/product_exhaust_detail.asp?id=251&pageNum=1

Here is the electronic controller for it
http://www.apexi-usa.com/product_exhaust_detail.asp?id=227&pageNum=1

so what do you guys think???

Apexi puts out good products. As long as you dont close it all the way off, it could potentially work perfectly. hopfully it wont give the exhuast leek popping sound.

i have a DMH elec. cutout on my supra and it is NOT there to make things quieter, in fact, when open its LOUD.

Switchable exhaust cutouts are an OLD SCHOOL item, intended for high horsepower engines that would benefit from a completely open exhaust. They're basically a butterfly valve that acts as a "railroad junction" that switches the "track" that your exhaust flows down. Stock exhaust for driving, open for track use. When open, it will most assuredly NOT be quiet.

My 2.5 cents.....unless you're making an obscene amount of power, don't get one. All you'll be accomplishing by driving on the road with the valve open is sounding like a jackass with no exhaust on a stock vehicle.

i dont think that is what this is. I think this goes inline and cuts the size of the opening on the internal diameter of the exhuast pipe. Like haveing a twist valve in a pipe that has water flowing through it. the more you close it, the less water that flows.
This would change your exhuast note by adding more back pressure. it would also rob you of horspower.