It really depends on how much power you want to make ,and it also depends on how much money you wants to spend.
You can get 400-450 rwhp just by doing a head and cam swap .(3-5k)
So i wouldnt use a power adder at that rwhp rating .
Anything over 500 rwhp and you will have to setup a forged motor and decide which of the evil power adders you want to use and build the motor acordingly , but you have to have a hp number in your mind to shoot for .
I wanted 500 rwhp n/a and 800-850 on the spray .
I run about 500 rwhp everyday and that will pretty much take care of 99% of the cars on the road that i run into and for the other 1% i open the bottles and spray up to a 350 shot taking me up to 850rwhp/900 rwtq .
Then i turn the bottles off and drive my car around n/a waiting for the next victim
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Iron 408 , Callies crank , Diamond Nitrous Pistons , Lunati Pro Billet Rods , AFR 225's ,All ARP , 238/242 , 11.8:1 , FLP Stage5 tranny , Kevlar 5 disk 3600tq , N/x 2 stage 350 ,PLX wideband ,90mm Fast intake/tb .