1. faq
2. google
3. site that sell the engine and parts have stuff on them as well
www.srswap.com
has a faq that explains the engines
ok
S13 red/black same just blacks are newer than the reds same turbo and power
S14 T28 turbo rather than the T25 used by the older version i believe that some have VVT [variable valve timming]
S15 also uses the T28 turbo has a 6spd tranny, 250ps verses the 205 produced by the S13/S14 motors also a VVT engine
this is off the top of my head i don't feel like looking it up so correct me if im wrong anyone. ya it bothers me too when people ask questions like these where they could've found the answers themselves easier and faster surfing the net, but they'll never learn if you don't tell them.
oh ya be glad you didnt get the really mean people
[the toys he's making fun of them like they're in first grade or something]