I did a search on ebay for some exhaust for my b16 going into my 97 EK hatch. I found that everybody is selling these catback kits and "high flow cats" for super cheap. Anyone buy any of these? Just seems a little sketchy to me, a cat for $10 and cat back system for $100, header for $75. Hmmm, probably not reliable. I am willing to buy something used but don't want to get ripped off. What to do, what to do?