[Uscman84]

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?

 

[K20giio]

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