The economy is slightly better over the last few weeks, although I'm currently running down a full tank to compare to the full tank pre mods (same type of use). This will take a few more days, then I'll have a tangable comparison.
The emmissions appear better but not tested, I used to get a black belch from the exhaust on start up, rev up high and when it changes to top at 50mph (auto). I still get some smoke but it's not black and there's less of it.
The performance has improved (not a sports car) but there is some improvement, more noticeable from 50 -70.
The K&N I fitted was a panel filter direct replacement, not an induction kit, so there is no intrusive induction noise.
Cheers