Subaru Impreza Sti Spec C Twinscroll Twin Scroll Downpipe Down Pipe Project on 2040-parts.com
Hicksville, New York, US
I decided to sell my twinscroll downpipe project.
This is suitable for someone that has a GD body, 2002-2007 Subaru Impreza WRX Sti and has an exhaust that is not JDM. If you have a USDM or any other than JDM midpipe and muffler (catback), then the length of this downpipe will be suitable.
All the components here, except for the hanger are unused, new. The hanger is in an as-new condition.
The reasons I decided to begin the project are:
-The downpipes available for twinscroll applications are beyond ridiculously expensive
-The diameters of these downpipes, many of which are over $500 are not even close to 3". When they describe them as 3", in fact that may or may not be the outer diameter. Sometimes they forget giving you the diameter completely, but remember to charge you $800 for the cost of ... a pipe.
-Some of the more affordable downpipes neck down to that factory donut, so as t "fit to the exhaust with no modifications". Why have a $500 pipe, if you restrict it's diameter back to stock, at the far end?
-Some of the remaining offerings are JDM length, so you have to extend them 4" to make them fit a USDM car, ridiculous after you pay that much.
-Nobody seems to have counted how many oxygen sensor bungs they should give you: The Twinscroll EJ207 has the main oxygen sensor AFTER the turbo, so that takes the bung on the bellmouth housing. Then there is the rear bung for the rear oxygen sensor. But where to install the wideband? You don't get a viable answer, after spending a ridiculous price for this pipe.
So I set out to make my downpipe, by buying a USDM length single scroll 3" stainless downpipe. This has a 3" outer diameter, but right there is better than most twinscroll offerings.
I also bought a kinugawa cast bellmouth twinscroll unit. While this looks good, it turns out to have unbelievably thick walls. This may be good at heat retention but necks down the inner diameter to less than 2.6", at the area where you need it to be the largest. Also, the shape of the opening of the bellmouth has to be gasket matched, as it's not close. I did this.
I came up with cutting this bellmouth in an area where it's cross section is still large and slightly oval. I think the equivalent oval cross section came in slightly over a circular 2.7". This is now close to the inner diameter of the remaining 3" pipe, from the USDM downpipe. I then flared the neck of the downpipe, to fit over the bellmouth outlet. Very difficult with stainless steel, to flare it out, basically hammered it.
I got an additional bung welded at the far end.
I bought an OEM hanger, I cleaned it up and fitted it, mocked it up on the pipe (but never had this welded), since the manufacturer of the ebay generic single scroll downpipe "forgot" to install a hanger.
I got some rough welding done for the bung and the neck and then having the unit finally in one piece, was able to test fit it to my 2002 WRX body. It fit!
At this point, I decided to make this into a catalyzed downpipe. So I bought a 100cpsi converter in a 4" unit, the biggest flowing unit available. I began fitting this to the downpipe and cut a section of the downpipe, to make room for it.
FYI: All the big names, especially a Zerosports, etc, if they are "Jasma compliant" have a quite dense converter, that proves to be a restriction, as high as 400 cpsi. Even an APS converter has more than 200 cells per square inch. Godspeed? 200. To go to a brand name with 100 cpsi, you have to go to a Milltek or H&S.
I since threw out the section I cut, but still have a small section I had cut from the bellmouth.
Anyway, I never fitted it successfully after this, because it seemed I had cut 1/2" too much at one end.
So, this can be easily put together by someone that has welding skills and a welding machine available. I did not have any, had to use a meineke and pay for every welding session.
If you don't want to make this catalyzed, you can buy this kit cheap, and get a section of 3" pipe welded instead.
Here is what is included:
-the bellmouth, kinugawa welded to 3" stainless downpipe section.
-the rear of the downpipe, with the extra bung welded
-the gasket for the far end flat flange, where the midpipe connects.
-the stainless bolts that go with these
-The OEM hanger bracket, that needs to be welded to the pipe
-The 4" 100cpsi catalytic converter, metal substrate
The welds that I had done (paid for) to the bung and bellmouth are low quality and need to be gone over, by a welder that has the time to put into these.
With this said, I will begin this at a really low price, because these are taking up room in my garage. By the time everything was added up, new downpipe, new bung, new bellmouth, OEM used hanger and welding, my cost was over $300, before adding the expensive catalythic converter.
There is no warranty, the sale is final, there are no returns.
Exhaust Pipes & Tips for Sale
- Chrome exhaust tail pipe 6 inch x 20 inches duramax diesel international mack(US $99.99)
- Porsche cayenne turbo 957 07-10 tequipment style exhaust tips audi q7 vw touareg(US $280.00)
- Car exhaust tip stainless steel us seller! free shipping(US $12.99)
- Stianless steel downturn tailpipe 2.25" new techtonics tuning vw audi(US $24.99)
- new nos jeep cj mopar chrysler renault amc tailpipe(US $17.00)
- Headman headers(US $95.00)
China automaker Brilliance halts Europe exports, executives say
Thu, 29 Apr 2010Brilliance China Automotive Holdings Ltd., BMW AG's partner in China, has halted its car exports to Europe after its BS4 and BS6 sedan met with a cool reception, and there is no timetable for a resumption, senior executives said on Thursday. The head of Brilliance's former importer for Europe, Hans-Ulrich Sachs, told Automotive News Europe in March that another reason the automaker struggled is because it refused to lower the starting prices on the BS6 and BS4. "They didn't want to lose any money per car," said Sachs, the former boss of the now dissolved import company HSO Motors Europe.
Chery Shooting Sport concept
Mon, 16 Apr 2007Chinese manufacturer Chery will be presenting the Shooting Sport concept at the Shanghai Motor Show this week. The Shooting Sport was designed and constructed by Torino Design in Italy, as with the recent Coupe and SUV shown at the Beijing Motor Show. The car is a compact, front wheel drive, four seater + luggage, three door 'wagon-coupe' offering space and flexibility.
Documentary looks at history of Batmobiles
Tue, 17 Jul 2012Not many cars are as recognizable as the Batmobile, even with its multiple iterations—from the George Barris concept to the Tumbler of the Christopher Nolan trilogy. An upcoming Warner Bros. documentary features interviews with directors of the unforgettable movies by Tim Burton and Christopher Nolan, and the wish-you-could-forget films of Joel Schumacher, all exploring the Batmobile.