If it is stock SOHC non-vtec........the most he can do is 50.......maby..........He should do more work on engine....like work on exhaust system and intake.......no point in spending money of it if your not doin more than 65 shot nitrous.....it can ruin the engine otherwise. The D16 models need to be worked on alot before adding nitrous. other wise you can screw up the engine. so spend money anything but nitrous and turbo.