apexi active tail silencer
 

here's a link to it
https://www.prostreetonline.com/news...r/image007.jpg
http://www.prostreetonline.com/news/...tail_silencer/





this guy dyno tested it compared to a cheap silencer and no silencer at all. interesting. the test car was a 400+ whp skyline, which is a 2.6l straight 6, which is in the same ballpark with exhaust flow as a stock REW i'd say.
http://www.tuninglinx.com/html/apexi...ncer-test.html


has anyone used it? i have a cheesy cheap exhaust on my car right now and i'd love to get a nice N1 style catback, but they are just too damn loud. anyways, with this, it seems to quiet the exhaust down quite a bit and not lose nearly as much power as you would from a standard silencer.

I think it would be awesome. You don't lose low end torque, and you still get high end power. AWESOME PRODUCT I TELL YOU!

we have turbos. we have all the backpressure in the exhaust that we need for lowend torque...

I've been trying to find stats for the PS revolution for ages. It piloted this technology. No one wants to try it and find out if it really works.

I have the 90mm one sitting in my garage. I used it for 2 months on my WRX, but in the end decided to switch to a completely different exhaust.

It definitely made things quiet while putting around and opened up at WOT.

If you want it PM me. (It was $145 brand new + shipping).

- Chris

awesome.. I need them for my n1 dual.. anyone know where I can get them cheap!

145 was the best I could find from a reliable vendor.

A'PEX-i did a test of their own, and the baseline run was 267ps, with the R55 it was 285ps, and the PS Revo was 282ps to the wheels. So with that said, it was a 3 ps loss compared to their flagship R95 exhaust system. Which is really good.

Well, that's true, but the reason they created this exhaust system is because when you go full 3 inch piping, you lose low end torque but gain high end horsepower. They made it so you keep that low end back pressure and it fully opens at high rpm, so you gain high end horsepower. That way, you have the best of both worlds.

For those who don't like the N1 canister style, there is a new RS Revolution too. The PS revolution starts it's piping with 80mm to 95mm to 97.5mm. The new RS starts at 85mm to 95mm, and ends with a muffler at 100mm. That's pretty big.

I think they were also taking into consideration the sound parameter. i was just waiting for a fix-it ticket for my 3" open exhaust.

Yeah, everything time I see my buddy with his HKS Hiper, he would always try and get me to swap exhaust with him.

Why not use the Exhaust Control Valve (ECV)? http://www.apexi-usa.com/product_exh...=251&pageNum=1

+1 to the ECV. what i'd be interested to know is if we can use ECV to control the backpressure instead of having a highflow cat on the midpipe to help with boost creep ??

I have two of these (90mm non-turbo n/a) on my dual N1s. Much quieter than unsilenced. I don't have dynos with them on or off but it doesn't seem any different than before I got them. I think this ECV valve would probably be the best option. Sometimes I wish my car was loud again!

-Andy

Yeah, sometimes I wish my car was louder too. My exhaust is tuned to open all the way, and it's just some what loud. When I tune it to as quiet as I can, it's almost stock.

turbine wheels and restrictive turbine housings provide more than enough backpressure to prevent the loss of low end torque.

standard silencers for N1 style exhausts flow horribly, so they made this new silencer to help with FLOW while keeping the noise down. :)

True. What I stated above was just what I read off of A`PEX-i's website =Ox. Regardless, good stuff, awesome products, and I'm going to get a Knight Sports Ti Exhaust next year. Hear that Ramy? LOL

does this silencer work with any exhaust, or is it just apexi specific?

I looked at the website and it seems like they offer it in 115mm and 90mm (turbo n1, gt spec, and n/a n1 respectively)

Now if I have another exhaust with a similar design (jic or other canister type) and the tip matches, would this silencer work? would anyone have an answer to this? Thanks.

that silencer will work with any exhaust that has a 115mm and 90mm outlet that is atleast X deep enough for the silencer to slide in.

And it uses one bolt to hold it in.

My magnaflow tip is 5 inches (~125mm). I wish like hell I could use one of these in my setup :(

I'm running a Kakimoto GT1.0z ti on my wrx and it worked fine. I'm 99% sure the Skyline in those tests was running the same exhaust.

I'd think that you could have an adapter made to make up the extra 10mm but then it might restrict the flow of the larger exhaust or just get stuck open all the time.

-Andy

I think it wouldn't get stuck open at idle, but for sure it wouldn't be fully closed.