Well Here I Say That Its A Matter Of Fact How's The Condition Of Engine You Have With You....No One Claims He Have All New Motor From JAPAN With Just 4000km running.......The Motors You Have Might Have Done 40-60k Miles........So It Depends On Condition Of Engine As Well......!! Here Mostly Crappy Motors Exist Alot.....!!
I Have Seen Couple Of 4AGE's And B16 Running Slower Than Even 4AFE's And D16's.......Why Is That So.....???
I Have Personally Seen B16's And 4AGE's MySelf And Have One 4AGE With MySelf.....Both Have Their Own Plus Points And DrawBacks.....!!!
But Its True 4AGE Is Not So Easy To Tune......One Need To Have Much Know How About It...Else He Can't Get Real Thing Outta It.......Lil Lil Things In 4AGE Matters Alot As One Can't Imagine It Can....On Other Hand...B16 Just Run Over With Main Basics.....!! Thats My Personal Experience.....!! But Sourcing B16 Parts Is Quiet A Hell Of Job....Cost More Than 4AGE Ones....!!
You Can't Get 4AGE Running On Its Best Easily....!! Once You Are Done......You Will Be Amazed Driving It...!!