Quote:
Originally Posted by m4a1mustang
The harshness won't dissappear but it might abate some of it. I know when I added my CBE and Injens, the engine was not quite as harsh above 6k but it certainly wasn't smooth. There was a noticable improvement, though.
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With a proper exhaust and you add a TWIN turbo you (not single) you will hear a lot less harshness in the engine. It won't go away, but it will reduce.