Has anyone done this mod yet? Was browsing around IWSTI and found this:

Fuel Line Extension / Stumble Fix Mod - Subaru Impreza WRX STI Forums: IWSTI.com

Apparently it fixes the stumble found in the GR STI's at 2500k-3200k rpm from inadequate fuel delivery due to the length of the fuel line. And it also helps with general cruising driveability. The thread explains some minor tunning is required. (anyone with an AP and access tuner race or open source tuners would have to adjust Engine Load Compensation Cruise (MP) and Non-Cruise (MP) tables).

 

I haven't done this to my car yet but I really want to because that stumble is so annoying!
Just have to not be lazy one day haha

 

if you are simply looking for information on it, Ed@eqtuning has completed this mod on a number of cars.

 

saw the thread and definitely considered it, but the AP table mod is necessary I'm sure, I have to read it again and see if it'll work without additional tuning. If you look for parts and things let me know, i'll come over and help wrench

 

The thread says you can, you just need to reset your ECU and you'll run a little rich where the tune in the tables would be. I'm gonna do it but i'm gonna read into changing the tables in access tuner race before i do.

 

Just launch control. No studder. Lol

 

Subaru Fuel Pressure Regulator and Damper Kit

I used this. Little expensive but its plug and play. Feel free to call Stephen at IAP if you have questions.

 

Eq did mine a long time ago, worked great

 

i didn't know they made that! someone in that IW thread mentioned doubling up their stock FPR with their aftermarket with some extra hose; looks like that's what this kit is, not bad for a more 'oem' look