a buddy of mine bought a nitrous kit and it doesnt feel like 150hp to me my 150 comes in harder

 

that will be determined by the fuel pump used.

every car will be different...some hit hard others soft.

My old nozzle kit hit so soft you couldn't tell you were spraying until you picked up your timeslip and it showed 120mph trap speeds...would trap 108 NA

 

i know anything above 150hp should have a better fuel pump but hes got the 04 gto and it doesnt feel like its in at all and hes only improved by 1/2 a sec

 

Well What kind of kit, what jets are in it? Some Kits rate there shots differently.

 

Is the car an A4 or M6...what were the 60' times and 1.4 MPH compared to NA......there are way too many factors involved to guess on whether or not he is getting full benefit from the nitrous.

the seat of the pants dyno is not very accurate.

 

well judging by your sig you have are spraying a 383, so I'd imagine it's higher compression with better flowing heads, a rated 150 shot will make more power on your car than a stock comp. h/c lt1

 

Bandit , its goin on a stock LS2, not an LT1.

How long are the lines from the solenoid to the nozzle? The longer they are, the softer it hits. Does he have a purge? Double check the N20 lines/fittings. Make sure their tight. If he is gettin air pockets in the line, it will hit really soft. Double check the jettings.