I used to be into motorcycles, so I knew which exhausts were popular. My favorite was Yoshimura, Anyway, I'm out of the loop on car exhausts and would like some suggestions to review for a 2013 Civic Si. No engine mods except for K&N air filter (I know it doesn't count), and might install an Ingen SP Series (https://www.carid.com/2013-honda-civ...specifications).

Also, would like some guidance on whether changing the header along with the muffler is worth it or not. I'm willing to spend money if the benefits are considerable.

 

its worth it if you get flashpro. flashpro alone with new cal will bump hidden power.
I got sudo exaust from ebay sounds great. not raspy and not ricy. full exhaust for my 8th gen Si was like $170 I think. header was $80. 0 issues with ebay header

 

Get a proper 3" exhaust like the Ktuned one or Full Race... they have a very deep tone to them.

 

dave is right. 3" is the way to go. but if your in a pinch the sudo exhaust is 2.75" and is cheap cheap. but its good quality and it sounds good. bolted up perfect

 

Damn it! Just saw this, and it's too late. Thanks tho!

I went with the injen sp axle-back, and the car sounds great! It's pretty deep and loud at the higher end or when accelerating, but quite at the low-end and when cruising, which is what I was looking for.