Any turbo mods are pretty much universal...a boost controller or BOV anyway....the downpipe is going to need to be made custom...you shouldnt need more fuel until you start upping the boost....my suggestion would be to try Injen Racing's new CAI for the Mazdaspeed....do a search on www.protegeclub.com , also another suggestion would be to go with a 3" catback exhaust,which would also be something you would need to have made custom at a muffler shop....other great mods would be some Tein Coilovers,a turbo timer(universal)...be careful on that tranny though...even though Mazda gave you beefier axles and a LSD,they purposely limited horsepower on this engine since the tranny wont withstand much more than 250 hp at the wheels...this car is a handler,not a quartermile car....a mustang might hand you your ass on a drag, but they would be stupid to challenge you in the twisties...not much can compare to the Mazdaspeed in the corners!!!!!