Invidia (HS12HC4GTT) N1 Cat-Back Exhaust System with Titanium Tip for Honda Civic Si Sedan

Always heard great things about Invidia and wasn't let down! Be warned if you are looking for a quiet exhaust this might not be for you. It isn't super loud but definitely louder than stock by a lot. Fairly easy install and shipped quickly. Useful tip - use some spray such as wd40 to loosen up the stock exhaust from the tricky hangers that keep the exhaust in place. If you are wondering what it sounds like check it out on YouTube there are plenty of vids. Hope this was helpful!

If you a Honda guy or have done research on this exhaust you know it’s loud. Fit right on no issues. Loud and deep toned. Smell to it but that’s natural since it’s brand new. Arrived a few days early too which was a plus for me. I’m happy with my purchase. Oh and it’s for a 4 door si, not a coupe. If you copy the part code and do your research you’ll see.

10/10 would buy again. Very deep exhaust note and super loud. The only reason someone might not like this exhaust is if they don’t like cabin drone which is understandable.

This product doesn't fit the Honda civic si 2014 coupe. I returned the item and they dont want to refund my money

I just received and installed this exhaust. Going from a glasspack on a stock exhaust to this was a nice change. As my glasspack would "pop" on higher RPM'd shifts this exhaust does NOT. It is quitter than my glasspack however I know once the fiberglass in the muffler starts burning out a little bit it will get louder. Great exhaust and easy to install yourself if you have some ratchets and a few jackstands!Invidia N1 is a great exhaust, best mod to date!

I know I ordered a used exhaust but I wish I would have known about the bent exhaust tip

I installed this on my 2013 Honda si it sounds nice but you can hear it in the cabin a lot. I had the same exhaust on my brz and it was more quiet. I still recommend it if you don’t mind a loud exhaust. Doesn’t sound raspy and has a clean sound.

Great product just a bit too loud, it sounds pretty much if I didn’t have an exhaust. With the silencer the problem is solved though. Without the silencer sounds like an old car.