I've always preferred the stock catback over any of the noisy aftermarket ones, and until now, I had been using a 3" QTP Electric cutout.

Well, the QTP cutout, as convenient as it was, ended up being quite a pain in some ways. The motors seem to die every 6 months, probably from exposure to year-round weather. The motor also opens and closes very slowly... it takes at least 5 seconds. It also makes tuning a bit more difficult because the car idles different with cutout open vs. closed, and it just takes longer to tune WOT as you have to tune both conditions.

In steps in my hero, the Boost Activated Cutout. The one I purchased was from Sound Performance. Yes, the price is steep, but it seemed like it would solve all my problems with the QTP unit.

It starts to open at 5psi and is fully open at 11psi. I'm absolutely in love with it. I just started tuning my new 2.1L HTA86 setup, and couldn't resist the urge to post a video of the cutout in action.

https://www.youtube.com/watch?v=F7pv2dvMIEc

 

holy **** that's badass!! very cool. one second family sedan, the next, race car!

 

I wonder how well this would work if you put it inline in the exhaust and cut the "throttle" plate so that it would let some exhaust past when it is closed.

 

So its an exhaust wastegate...............

 

I so want to do this!!! I'm still working on my boost activated QTP, but I think I'll nix it and get the SP cutout like yours. I've never seen it mounted reversed like that. Is there a benefit to mounting it like that?

 

I already had the Y-Pipe from my QTP, and when I tried to install the SP cutout in the intended position, the actuator runs into the driveshaft.

My choices were to A) modify the SP part, B) Add a 2" spacer to the flange, or C) Install it backwards.

I went with C, it still works just the same

 

Nice, good thinking.

Did you order it online or call it in? I tried to do it online last week, but the server presented an expired certificate. So I ended up getting SpoolinUp COP instead. I may call it in next month.

Do you have any hp/tq numbers gained with this?

 

I did order online (despite the expired cert).

I don't have any numbers as far as gains since this is an all-new setup for me... new motor, new turbo, new cutout.

They claim pretty big gains vs. stock exhaust (doesn't every cutout?). A test vehicle (~500whp Supra) apparently made +55whp with the cutout vs. stock exhaust:

https://www.youtube.com/watch?v=mvCl-v_AzLE

 

I'm also planning to do that as well. I'm running the Works catback mated to OEM muffler and plan to install a boost actuated cutout right behind the muffler.

Yes you are correct that it is expensive and in my opinion more than it should be.

 

I love mine! Best mod I've done.

 

Interesting. American hotrods meets foreign technology.

 

Cutout??? Are you talking about an open dump? Hell, I feel like a noob! So please excuse my noob question.

 

No, although I have an open dump as well.

There's two paths for exhaust, one is through the wastegate and the other is through the turbine/downpipe/catback.

An open dump wastegate is before the turbo. An exhaust cutout is after the turbo.

I am now not only dumping the excess exhaust via the wastegate (exhaust no longer needed to power the turbo once it has hit full bost), I'm also dumping the exhaust that is used to power the turbo via the cutout.

 

That price is definitely up there. Sounds like it works.

 

I've had my eye on those for a few years now, they seem decent but honestly I still wonder how they hold up through a few winters of crud.