i self fitted a nitrous kit to my 180, it was a wet kit from wizards of nos, which is much safer than the old dry kits, and i never had any problems. You get real big gains which are very obvious.
This is another reason i know re maps are worth next to nothing, because if you fit even a small 25 bhp shot of nos the gains are instantly grin inducing and you suddenly feel like your driving a porsche, this is nothing like when you have had a re-map, when the best you can say is " it feels like it picks up a bit better".
ive known umpteen zs run with mods but no remap and reliability was never compromised, having said that, to back up something stamford said, it seems a fair few zs run a bit lean at the top end when they have had some mods done, so if the afr can be tweeked it can't be a bad thing and will gain you a couple of ponies as an added bonus.
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