anyone try this Z1 module adds up to 20 HP ??
More info on this "Z1 module"? It sounds fishy to me because you didn't provide any information--is this an intake mod, an exhaust mod, a miscellaneous engine mod, a turbo kit? Where's a website that shows pictures of this "Z1 module" installed in a Hyundai automobile and includes before-and-after dyno graphs? The headers on your message say this was posted from near Chicago, Illinois--has a Hyundai group near there been talking about some parts with "Z1" in their model#s? You *can* get 20 more HP out of a V6 Tiburon without breaking the bank or your back. Cold-air intake kit+K&N filter+replace OEM exhaust back from the catalytic converter = ~25 more HP for ~$1000. Received wisdom from the Taurus SHO people says the best, cheapest way to get more power out of a car is to open up the intake and open up the exhaust. Anything else (forced induction, N2O, etc) gets expensive quickly.
All of that stuff on eBay is crap. It is a $0.29 resistor from Radio Shack in a box. The idea is that it tricks the computer into thinking that the air is cooler than it actually is. The computer responds by adding more fuel. On a car that runs lean by deafult (like most domestics from a decade ago) this will help and there will be a power increase. All Hyundai vehicles run pig-rich from the factory so it just makes an existing problem even worse. You will lose power and get worse gas mileage.
