i have a 94 ls with about 126000 on it just wondering if it would hold up for a nos

 

As long as your motor is in good running condition, and you have the nitrous correctly tuned, and use it wisely, your motor won't be damaged. But if you ghetto rig it, or constantly use it, say bye bye to motor.

 

i have a 98 gsr with 99,xxx miles on it. and i have used nos for about 10,000 and i just took my kit off and did a compression test. 200 psi in each cyl.

 

Just make sure you do a compression check and also make sure your fuel system is up to par: filter, fuel pump, injectors cleaned (if you go dry kit)

 

like they are saying...just do it right the first time. 50 shot, colder plugs, retard a bit of timing, maybe a fuel pressure regulator (and if you get really into it, like upping the shot, do an ignition and nitrous mastermind)