could i use ls pisons in a civic ex, to lower the compression, if so any one have any?

 

the ls wont fit. There's someone on this site (i think it's TurboPanda) who sells supra turbo piston with b16 rod for the soch engines. He says that you can run 1.2 bar(close to 14lbs) on them safely.

 

ls pistons are quite a bit larger than d16 pistons. You might be referring to the ls rods swap instead of the pistons. this can be done, but it requires machining of the rods and an aftermarket piston. Pm me if you have more questions on the rod info.