Please PM me when this product is available

 

Do you have a price of the turbo back yet? how about the weight? weight difference between that and stock? Has it been tested on Any US evo's yet?

 

Sorry, we have not had the opportunity to test the Helix cat-back yet for the EVO. The weight savings should similar to most exhaust systems on the market. Also Helix has told us that they have titanium systems in the works. Thanks!

Gary
Gruppe-S

 

Update on the downpipe?

 

why heat warp wene you can thermal coat! heat wrap can trap moisture and cause piping to crack , well i know this is true for headers but id assume the same for down pipes also anyways you could thermal coat that inside and out yay!

 

damn! It's 3 inches, clears stock lower arms, bolts to stock cat, looks damn good, and is well priced. I WANT

 

I've never been a fan of downpipes that don't have flex sections. You really need one to keep things in your exhaust system from breaking or stressing. Have you ever seen the way an engine twists in the engine bay under full load? That movement has to go somewhere.

 

Well, there are springs holding the clamp on, that'll allow a little movement. Beyond that, I think it has enough give.

 

Does this thing exist yet? I'm about to buy the HKS

 

It sure is "shiny," but is there an O2 bung

 

I am not a big fan of downpieps without flex sections. I have seen way to amny downpipes without thne crakc over years and years of daily driving.

That is we build all our downpipes with big SS flex sections.

Plus we also offer our famous 02 eli downpipes.

 

I'm always one to find something to complain about. There is a reason that the stock O2 housing dumps the wastegate exhaust a few inches down stream of the O2 housing inlet. Flow out of the turbine is vital. You don't want to disturb it with wastegate exhaust turbulence.

RnR, your O2 eliminator wastegate dump should really re-enter the exhaust stream after a few inches. And the farther away from the turbine you can do it, the better.

As well, why did you put the O2 bung on the wastegate passage? You want the O2 sensor to sit directily in the exhaust stream. When the wastegate is closed, that O2 sensor placement doesn't allow for this.

 

Actually that is an old pic, but just up there for reference. Our new design has the 02 bung in the stock location for better fitment and flow.

The 02 elim is much better flowing unit. The flange that is used for the EVO turbo is open mouth style so we must use a bellmout downpipe like the one you see.

We experience no boost creep at all with this unit. So wastegate flow is fine. Also with the twin wastegates it would be hard to fine a pipe that would be large enough and still fit the EVO.

 

LOL Threadjack!

I've seen several DPs with flex sections develop a leak at... you guessed it- in the flex section. The DP (company name withheld) on my 2G did this too.

I'm excited to see the Helix unit!

 

Hi!

Fireball - We have 50pcs that arrived at our warehouse in Saitama Japan, but unfortunately it will not land until end of November as it just missed our container. We will keep everyone updated!

4-BNG - Yes the production units are available. If you want to pay the air freight charges, we can have it aired over, but that can get expensive. If you cannot wait, we would recommend picking up an HKS unit from us In terms of the 02 bung, the first 02 sensor is located on the housing which is not replaced by this downpipe (Helix will have a separate 02 housing that will be released soon), and the rear 02 goes on the cat (which this does not replace either)

RnR - According to Helix Japan and our experience, the give in this particular exhaust system is found in the spring loaded bolts that attaches the downpipe to the 02 housing. This is true on many cars, such as honda exhaust systems. This is also why the factory downpipe does not incorporate a flex section.

Thanks,

Gary
gary@gruppe-s.com
www.Gruppe-S.com
510-498-8400
510-498-8882 fax