legacycentral bbs

Posted: **Mon Apr 18, 2005 3:07 pm**

Had it installed Friday.

helix downpipe to qtp elec. cutout to stock exhaust (no cats).

It sounds almost stock closed and like hell on earth open

The turbo is noticably louder and spools quicker.

hopfully I can get it to a dyno in a few weeks to see the difference from closed to open.

Troy

Posted: **Mon Apr 18, 2005 3:25 pm**

Hehehe, right on.

I bet that is LOUD as hell when open!

Posted: **Mon Apr 18, 2005 3:29 pm**

legacy92ej22t wrote:Hehehe, right on. I bet that is LOUD as hell when open!

Yeah I thought my dash was going to rattle apart.

And the wires are now tucked against the body and not hanging like in the pics.

Posted: **Mon Apr 18, 2005 4:44 pm**

I have been thinking about getting a cut out for a long time. I just might after this. I run Open downpipe about once a month or so, and I love it. Sounds so hardcore.

Posted: **Mon Apr 18, 2005 4:48 pm**

did you have to modify the downpipe at all? is there a noticable difference between open and closed? looks sweet!

Posted: **Mon Apr 18, 2005 5:26 pm**

The downpipe isn't modified except a small dent to clear the tranny pan.

It feels quiet a bit faster open but I'll have to leave it to the dyno to show how much of a difference.

Whats really nice is I can open it up just a little and have a really mean (but not to load) sounding exhaust.

Posted: **Mon Apr 18, 2005 6:06 pm**

So this is like some controlled TB for your exhaust? I'm not sure I understand what's going on here..

Posted: **Mon Apr 18, 2005 6:09 pm**

It's the same kind of butterfly valve as a throttle body, yes, though I'd imagine it's beefier. When the valve opens, it lets all the exhaust gas escape through the hole instead of having to go through the rest of the exhaust and muffler.

Posted: **Mon Apr 18, 2005 6:47 pm**

Oh.. so this is further up in the exhaust? I thought from the photo, that it was just before the muffler, or something...
Seems like a pretty good idea!

Posted: **Mon Apr 18, 2005 7:05 pm**

Yeah, it's right at the bottom of the downpipe.

Posted: **Mon Apr 18, 2005 7:06 pm**

aha.. I gets it. Thanks V!

Posted: **Tue Apr 19, 2005 6:28 am**

The only way to increase the pressure difference across the turbo is a short dump pipe or no exhaust at all. But its nice to be legal (somewhat) when neccessary, which is nice with a cutout like that. I'm interested in the results. Pretty clean under carridge buy the way.

Posted: **Tue Apr 19, 2005 2:43 pm**

93forestpearl wrote:The only way to increase the pressure difference across the turbo is a short dump pipe or no exhaust at all. But its nice to be legal (somewhat) when neccessary, which is nice with a cutout like that. I'm interested in the results. Pretty clean under carridge buy the way.

I was thinking about teeing into the downpipe close to the turbo but there isn't much room and a pipe would have to be made to dump the exhaust gas under the car. Which defeats the purpose of having the cutout close to the turbo.

It's clean because I'm always under them messing with stuff.

Posted: **Tue Apr 19, 2005 2:55 pm**

That's a nice setup, very clean. My future legacy will have something similar in order to maintain my sleeper status when I'm not running hard. It's gotta be fun for you to pull up beside someone at a stop light all quiet and then just open the cutout and blast off leaving them confused and deaf. Do you mind if I ask approx. how much it all cost?

Posted: **Tue Apr 19, 2005 3:05 pm**

I don't mind saying how much I paid.

helix downpipe = $250ish
y pipe and cutout = 189 + shipping
labor, gaskets & flanges = $120 (can cut this in a third if you can weld)
total = $560+/-

I pulled up to a 6 cyl. mustang with aftermarket exhaust yesterday
and opened the cutout. He kept looking around and couldn't figure out what car sounded so mean and I was sitting right next to him. Kind of funny people won't look in our direction even if we're right in front of them.

Posted: **Tue Apr 19, 2005 4:51 pm**

560's not bad at all. Lol, that's great.

Posted: **Thu Mar 08, 2007 11:45 am**

I am just about to do this exact thing. I'm getting a Tsudo 3" bellmouth dp from ebay and putting the cutout right after it, I can't wait >:)

are there any issues with boost creep due to the open airedness of the exhaust system?

Posted: **Thu Mar 08, 2007 3:37 pm**

I have been thinking of doing this since I heard it on a local EJ20G swapped RS.

Posted: **Thu Mar 08, 2007 11:53 pm**

Get a quality cutout, or it WILL fall apart.

Posted: **Fri Mar 09, 2007 1:57 am**

Very nice. I believe "Cheesefrog" was running one of these on his heavily modified Honda Bseries hatch when he spanked a dodge viper on a 40mph roll.

Posted: **Fri Mar 09, 2007 7:18 am**

so no boost creep then?

Posted: **Mon Mar 12, 2007 12:37 pm**

Looks nice!

Doesn't that turbo sound SO SWEET with her open! I love the sound of my DP uncorked and open!

HP gain or not....It's worth the money just to sound bad ass!

Where did you get the cutout?

Posted: **Mon Mar 12, 2007 3:24 pm**

A cutout has nothing to do with boost creep. Boost control and turbine housing design has everything to do with boost creep.

Posted: **Mon Mar 12, 2007 3:47 pm**

Maybe he means an increase in boost when its open due to the decrease back pressure???? Not really sure.

Posted: **Mon Mar 12, 2007 4:23 pm**

No, again, that's what a boost controller is for.

The wastegate will simply open to regulate boost.

legacycentral bbs

My secret weapon

My secret weapon