I have been on countless threads but none truly answer my question about my car. I have a 95 civic hatch b16 swap with a yonaka catback exhaust and it is reallllly loud in the cabin and it has such a deep tone to it. I have a test pipe now and want it to be a lot quieter. I've been Looking into high flow cats and I'm going to pretty much get one because the test pipe is really letting out some bad gases (yea, I'm a semi tree hugger) but my main question is, will it quiet down my exhaust? Thanks in advance.

 

Well, since you're getting a cat anyway, why not let us know the difference?

I would imagine that some of the sound would be absorbed by the cat more than it would by a straight pipe/test pipe.