I have a 05 wrx with Helix Downpipe, Helix upipe and Grddy EVO2. I am planning to reflash my ECU and I don't know what to get.

 

Gruppe-S has a much better reputation on this board, as Vishnu isnt really in the subie community anymore...but both would give a quality tune. I have a custom Vishnu dyno tune with ecutek.

I would suggest buying a Cobb Accessport for the sake of multiple maps and, now with the ability to protune you can have a custom tune--l just like ecutek. If I were to go back in time I would have bought the AP with a custom tune. Not to mention you can scan your own CEL's which is a great tool to have on a modified car.

 

yeah, get a cobb ap

 

Both things that you've listed are the same thing but with different tuners. Shiv (Vishnu) is an excellent tuner and Mike (Gruppe-S) is freaking awesome also. Can't go wrong either way. I'd also suggest a Cobb AP unless you just want a drive and forget about it solution.

-Geoff