I recently bought a new flywheel from someone on Craigslist and it's silver unlike all the red pictures I've seen. He had a 350z which is the same flywheel he just said red ones were the original prototype or maybe silver was idk. They are supposed to weigh 18lb but this one is a little over 17. Any chance it might be the wrong one? Maybe the z32(300zx) or anything? No way to really contact rps