Any pros or cons to running cat bypass with original muffler?

[Lew L]

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Installed a Lamonster cat delete. I modified the baffle so that it allows much more flow, and I welded it in place as I just don't trust one little screw with a minimal thread contact area. Also, I added pipe insulation to the cat delete and about 14" of the easy to reach header pipe. There was no loss of low end, better throttle response, more mid/top end. Minimal noise increase. All the results I wanted.

Lew L

 

[BertRemington]

This is key for several reasons including keeping heat inside the pipe and reducing exhaust pulse and resonance sound levels:

... Also, I added pipe insulation to the cat delete and about 14" of the easy to reach header pipe. ...