The benefit of the stroker kit is your low end torque. Not only that but with the normal size turbos (meant for the 3.7L) you will be flowing more cfm than the 3.7L which means the turbos should spool faster but with the negative effect of a lower top end. This is all dependent on the turbos you pick and the size stroker you go with. A big advantage of not going bigger than 4.0L is that you get to have stock bore size. One of the downsides of the 4.5L is the larger rotating mass which requires a special cometic head gasket. A plus side is the car has a lot more torque and acts more like a hi revving v8.
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