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I recently just installed a si muffler only on my car. The sound is what I expected. Mild hum. Anyone know if I put the complete cat back on too, which I have, will make any difference on sound or performance wise?
 

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I recently just installed a si muffler only on my car. The sound is what I expected. Mild hum. Anyone know if I put the complete cat back on too, which I have, will make any difference on sound or performance wise?
Yesss installing a whole back system will make it louder and increase hp by a few if you get a tune
 
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