I bought the ERZ hfc's after looking at the pictures and seeing the price. All the companies that make hfc's buy the cat part and fab the rest themselves. The flanges on the ERZ hfc's are thick which helps them stay flat and seal well. The supplied gaskets have some crushability to them that further assures a leak free connection. The O2 extensions that came with mine needed to be drilled out a little to fit the end of the O2 sensor(it could easily have been done with a round file). The install went smoothly and took me about 2 hours( I'm old and slow). The sound seems the same as stock at idle and low throttle. It is only a little louder at WOT, less noise increase than I expected. So far there is absolutely no drone and not a hint of rasp or hiss. The rest of my exhaust system is stock(so far). The smell was noticeable on the first day, but is gone now. Totally happy with the ERZ hfc's so far and thinking about Berk cbe.
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