amount of boost...and they spool early then the Z32 and you average gas vehicle...to really get that sounds A.) you are going to have to run a higher boost (but be careful with that) B.)get larger turbos C.) get some downpipes or even a full exhaust if you are looking for a good mod! D.) get some blow off valves (I run the APEXI twin chambers (not a fan of the chirp ones like HKS)...oh and btw dont worry about the guyz on here who like to be dicks! they were all in the same boat as you at one time! they just havent had there 1st beer yet!