the LTTC conversion has been out for 5 or 6 months now... its being sold at around 800 bucks... but the kit that u posted kenny you'd need some more parts... so it'd probably end up being 600 bucks if u found them used.

An opti is around 270 or something like that. Ive never had a problem with mine... the opti will start diminishing horsepower gains when ur pushing over 650.