Originally Posted by 2011 Nismo#91

Z1 products are good but also have a lot more hype than reality. I don't understand why inspection would be a problem for LTH vs STH and test pipes except if you are swapping back catalytic converters. Generally Fast Intentions LTH are the best option performance wise. But from a Dollars for HP perspective I'd avoid LTH or STH as the gains are modest but expensive. But if your looking to squeeze every little bit of HP/TQ then you gotta spend the $$$.