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Berk high flow cats for non hr, Nothing wrong with them at all just decided to go with test pipes. they are in good shape. would prefer a local pickup but will ship if nothing comes up.
The difference in power is somewhat negligible, test pipes usually make a few more HP, but its usually not that huge a difference, especially if not boosted. The sound and emissions are probably more noticeable with the test pipes being louder, more race car sounding... some would say raspy where as the hfc I think give the car a cleaner, more refined sound, and quieter but just slightly. Again there usually is a slight difference in power if tuned but its not much and the hfc's are just a cleaner crisp sound. I may also add that these where never used on my car, they were bought from another member while still attached to a y pipe. However I have been around and in numerous cars with both and as far as sound goes the difference is quite noticeable.