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dude........DC5
if he's looking for power the K20Z1 = stronger motor
FG2/FA5 has LSD and plus i've heard of tranny problems with the 06 Si's
Si Sedans didn't come out till 2007
Si Coupes are so ugly and K20Z3 = Weak
Definitely go with the DC5
He will be much happier.
-Ricky
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