no it's not bad. liek everything else, however, without a proper tune you can blow your engine, gaskets, and all sorts of other stuff. MY friend blew his built b18c5 three times, twice with NOS. then he learned to go to a different tuner, and he hasn't blown it since. It's a 500 whp turbocharged nitrous sniffing mean green lima bean. just get it tuned properly and you'll be fine. by the way, what's you paint? the sig is really interesting.