You will need the EWG itself and an EWG-compatible uppipe. This is usually fitted by a v-band connection. Yes, the internal wastegate will need to be either bracketed closed or welded (welded is better but irreversible).

Finally and most importantly, the vehicle will need to be tuned for the modification.

Catless, catted, doesn't matter when you have an EWG, though the catted downpipe will run noticeably cleaner. I prefer catted.

 

Ok, so it might be better to just run the High-FLow Cat? It is $350 for the Catless and $650 for the high flow Cat. I am planning to do Downpipe and TD04 to VF30 all at the same time, get 1 tune and be done, and that is where I am leaving car.

In terms of my goals, would you say the high flow cat is better. How much would it cost to get an EWG, all accompanying parts and get them installed (if I was doing it at same time). If it is going to be more than the High-Flow cat, I may just stick with that.

I am only doing this because I am worried about Boost creep.

 

Well, I don't know much about the VF30 besides that it uses the P18 housing like the VF39/43/48/52. If the wastegate is unchanged then, yeah... boost creep is a concern without a cat or EWG. Another potential option is to due a little bit of port and polish to the wastegate while the turbo is out of the car. It just takes a little bit smoother flow to eliminate the creep altogether. An EWG will improve top-end slightly as well. If it were my car, I'd prefer a hi-flow catted downpipe with the EWG, but no reason technical reason to go catted unless you don't like spewing dirty air like me.

I realize we haven't even touched on this yet, but I hope you are also installing an uprated fuel system. Just checked the map for ADM 2001 WRX and it has the same 420cc/min injectors in the USDM bugeye WRX. You should be on 565cc/min blues or pinks or larger with fuel pump as well. The new ID1050xs have a lot more electrical headroom but the modern BOSCH EV14 spray pattern means better low-load fuel control than the stock injectors. They are literally win-win.

 

Hey man

Yep I have a Walbro 255lph fuel pump, 565cc pink injectors and sti TMIC to go along with the VF30.

If I went cattless with EWG (thinking about getting the 38mm tial ones as they seem like the best), what else needs to be done? I have done a bit of research and it seems like the Upipe might need replacing, but I am not sure for JDM as some say the stock STI JDM WRXs upipe is fine but I am unsure for JDM WRXs. Apart from welding the IWG shut, and potentially doing upipe, do I need any other parts?

Cheers!

 

I've got a 44mm tial MV-r that I installed in my car to prevent boost creep after installing a cattless downpipe which caused me to boost creep and get fuel cuttoff. In my experience I had to do a couple of things. I had to go with an upgraded uppipe so there is somewhere of course to attach the ewg. I also had to go with an ecbs, and a tune. I did try a manual boost controller and it just didn't work out. Another thing I can recommend is getting a bracket for the internal Wastegate on the turbo to hold it shut opposed to welding it. I personally am not a huge fan of the idea of welding it, especially since the bracket is like 30 dollars from grimmspeed. Just got my car tuned at yimisport on Wednesday and I'm decently happy with the results. 310 hp 320 tq on a 2010 wrx with full bolt ons and the ewg/uppipe.