Yep i'm very pleased, I really wanted the car to cruise to the beach and run night wars at Meremere (NZ) so the revs changing was a fear factor for me while cruising. Just to give a run down. 1, Factory Calais with 2mm tread factory tyres on 98 basically 14.00 with PM 2.5inch cat back with 2.92 open diff 2, Changed the diff to 3.27 LSD with 17,000kms on replacement diff and 70,000km on car OTR also installed and Goodyear F1 Directionals (13.45) 3, Fitted Pacemaker headers and hi-flow cats, tuned to 96 at Pro Tune Automotive, Wayne worked with GM programmers in USA (12.92) Bad weather 20-30kph head winds and wet track in the morning. Almost cancelled it was that rough so expecting a better time next race day. I also turned off AFM as was advised by Wayne it was more a sales pitch/up sell than real gain... the drone annoyed the heck out of me, even though the headers made the drone less noticeable, it still annoyed the heck out of me switching on/off more often with 3.27 gearing, this did however highlight that the engine was generally putting in less effort more often as the engine switched to AFM mode twice as much. I'm a qualified technician (ex trade tutor) so i listen to the engine carefully hence i was concerned the gearing change would effect my cruising revs. (I only drag occasionally). I can say the 3.27 diff was very noticeable in acceleration and around town. The 2.92 was a very very low rev gearing, I actually felt it was to low. Having just been out to check tonight 50kph Revs are Just over 1000rpm (To be more exact maybe 1050max on flat road) 100kph Revs are on 1840rpm, I think by memory it was 1600rpm or 1650rpm at 100kph originally (I've seen posts on this exact topic stating others are at 1850 but mine is a rev counter needle thinkness below hence i'll say 1840rpm). I took the vehicle away and tried to drive as i always would, some passing and bursts on the throttle but mostly highway driving 100kph and reached 600km to the tank. Having had the car about 6 months i'd never done a full tank economy run before but am happy with 600kms to a tank from a car running the 12sec slips. I would do all these mods again in a heartbeat If i didn't drag race the car and i had a factory exhaust i'd still do the diff upgrade but maybe leave AFM on if it didn't bother you. I was told by my tuner he can turn it back on if i'm not happy without a dyno run required or fee. Note: If viewing the dyno chart ignore the ratio input on the screen, this was to compensate for the gear the trans was run in to do power runs. Hope this helps.