Rob Keehner wrote:
Non stock parts tuned to stock specs are still illegal. Even so you still need to look into it. If I were you I'd look at two things.
1. how often will this part fail?
2. how much and how easy is it to replace?
If an aftermarket part does the exact same thing as the stock part but it's stronger, more reliable, and cheaper IE just plain better. Then I say heck yeah go with it as long as it does't make the car faster. But if you get protested you better not whine because the car IS illegal. If it's a part that will fail at any random moment(neon mounts) why not go with something you know is better. But if it's a part you know will last for 50k miles or more there really is no excuse for an aftermarket one in my opinion.
don't know how often they fail. apparently with chipped cars (which mine is not) they fail as regularly as one per month. i haven't read much about the frequency of non-chipped cars failing.
they are easy to replace, probably a 1/2 hour job. if i see where you are going with this, i really don't want to change it out with the stock one for autocrosses. all this stuff is regulated by the MAF and they are flakey as is. if i go changing the valve out twice a month, i'm sure to break something more expensive.
don't worry, if i do use the part and i get protested, i'll take my lumps with a smile.