signing this petition will only give them numbers of how many people have modified cars, it wont actually change their minds. i was listening to the process of how a bill is passed. at no point do they say "are there any petitions against this legislation?". they read the bill and its positive effects, what it intends to do and as soon as they say "emissions this, emissions that", it will get passed. dont forget these are people who get driven around and/or have a car that is no more than 1 year old.
what you SHOULD do is get an engineers certificate for a modified car that fits in this category before this is passed, because if this bit of legislation comes in, the next step is to make it harder for older cars to obtain one.