hi mate,
Before you get smashed by everyone..... they will tell you to use the search....
there is plenty on here about both these motors into celicas.
i have had a 1g in my celica, and am now fitting a 1j.
Both can make good power. - 1j will make big power (over 250rwkw) easier and potetially more reliably.
but the 1j is heavier and bigger to fit in the bay.
1g is a much easier fit for a basic conversion - but is also older.....
So which is better? that depends on what you want, how much you can do your self etc.
Have a look through the members rides area - lots of celicas with both motors there...
Cheers
Stew
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