34 row oil cooler from FI or Z1. About an hour.
Stillen 3 Gen long tube CAI. About 1 hour. Prefer.
Air intakes under the hood. Don't waste your money.
LTH's. The passenger side about 1 hour. The driver side about 5 to 7 hours, depending on your skill set and pain threshold from being chewed up by the screws and bolt ends sticking out.
High flow cats or test pipes. Time wise depends on how much trouble the Demon bolt gives you. Some people have no issues with them. Others have changed their religion.
CBE. Depends on which system you get.
Tuning. UpRev or Ecu Tek. 2 ways to do it. On the dyno, or e-mail. If doing it be e-mail. Seb is the best. On the rollers. Depends on what part of the country you're in.