So far i cant comment on gas consumption. Battery was disconnected several times over the last few days so still in the relearn process.
Dont know if there is any top end improvement as the roads have not been empty enough to go WOT for any significant period of time. Not really concerned about the top speed anyway as i usually dont cross 140 km/hr
The improvement is in the manner in which the car gets to the 140 mark. Torque *seems* to have improved quite a bit.
Its not a matter of me now "mashing out" harder as i have always floored it to get anywhere.
What is alarming is that i heard the car from the outside today for the first time as my wife drove away. She drives just as hard as i do and the blasted exhaust is QUITE loud on hard acceleration.
At the shop and until this point, i only heard it from inside the car which is quiet and just slightly louder than stock sounding but i was like WTF this morning from outside.
Will be looking at some additional methods of quieting it down while still maintaining my free flow...