I haven't installed the Y-Pipe or HFC's yet....will be next weekend.
The Y-pipe is a direct bolt on replacement for the stock OEM Y-pipe and once Tanabe realeases the CBE, it should be using the same Y-pipe so it won't need to be replaced again
The feedback I've heard on the Tanabe Y-pipe is that if used with HFC's, it doesn't make the car louder then just having HFC's but actually a little quieter and deeper becuase it eliminates a good portion of the rasp
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