Stay away from ctr's. USDM b16a pistons are a good upgrade and usually work out to about 11.5:1 which is perfect for a street 93 octane motor. The CTR's due to their difference in comp height (wrist pin to crown) have a higher compression ratio than most of the available calculators say. With a gsr head you will end up alot closer to 12.5:1.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.