Hyundai: Tiburon resistor kit

Hi again...last question..lol.
Same car...2004 Tib I-4, 5-spd.
I see these resistor kits on ebay saying gains up to 20hp. Does this really
work? If so what size is the resistor that is used? I just can't justify
$4.00 for a resistor and $3.50 to ship it esp. when I probably have the
exact size resistor here with my pinball machine repair parts.
Well if anyone can help me out with any of these 3 questions I would
greatly appreciate it.
Thanks
Greg

"hyundaitech" <hotmail.com> wrote in message
news:talkaboutautos.com... 

Thank you for the info. When I saw it a few months ago on ebay I figured it
might just mess the computer up in the car just did not look safe for the
system but as curious as I am I had to ask where people would know...Snake
oil it is. As for a V6 when I bought mine I thought about it hard but
driving about 75 miles a day between work, school, and home I opted for the
I-4.
Thanks again
Greg