What are if any drivability issues with a flsah or a piggy back?

 

I have a Works P2 with the Exhale exhaust (just axle back for now...Hurry Works!!) If it werent for the slight rumble the exhaust makes one would never know it was flashed. And let me tell you.....you catch alot of people by surprise....i.e. STi. anyhow, seriously I have not had ANY driveability problems since the flash...almost 1k miles

 

How about emissions ie; the sniffer test? Better or worse? You would think it should be better than stock!

 

hmmmm!