my m4 used to be 491.17 whp on map 2 but somehow my car started to lose power.
after a while i installing toyo r888r and did a dyno run .. my car made 470 whp.
I've installed meth kit and my car did 447 whp with intakes downpipes catback jb4 on map 8. ( I've changed my spark plugs )
I've removed all of my mods did a stock run my car made about 400.75 whp
after that i installed intakes and meth only and my car gained only 5 HP ...
what do u think guys?
