hi im a newbie i was thinking of changing a 4g91 auto transmission in to
my wira , my question is does this engine perform better then my original
1.5 auto is it more smooter engine and normaly how much is it for complte
convertion help im a nerd on engines .

will definately perform better than your current engine, but the cost of
the whole operation will set u back close to rm8k. that includes half-
cut, replaceable service parts & labour.

another option is to do an overhaul of your current engine. costs about
rm5k, which includes engine balancing, full cylinder head job, new
oversized pistons and all servicable parts. only choose this option if
your current gearbox is in good shape. btw, is yours efi or carby?

mine is a carb version and im always on the road traveling north south
highway, i find my current engine is very rough when i go at 140kmh that
is bout 5200 rpm and very noisy also ,thats why im thinking of using
something with 4 speed auto, i ask the mech he recomended 4g91 so thats
why im hereasking so much question lor , can anyone give me a good idea on
what should i use for my wira i dont need turbo or mivec ,i just need a
smooth ride ... thanks

if that's the case, then get the 4g91......

thanks for the advise by the way i have alredy changed it and i find it
quite smooth and nicer to drive on highway. thanks a lot bro