Invidia Q300 Cat-Back Exhaust for 06-11 Civic Si Coupe/Sedan

Invidia Q300 Cat-Back Exhaust for 06-11 Civic Si Coupe/Sedan

The Invidia Q300 Civic Si exhaust is a full cat-back, both for the coupe and sedan fitments. You get a deeper, sporty-sounding exhaust without turning your car into a raspy megaphone. We run Q300 systems on our own cars because they hit the sweet spot for a daily, clean tone on the highway, then you roll into VTEC and it actually sounds like a performance part.

Invidia uses SUS304 polished stainless steel piping with mandrel bends, plus CNC machined flanges and robot TIG welding. That matters because a mandrel bent exhaust keeps the diameter consistent through the bends, so flow stays predictable and you do not choke it off where the piping turns. The Q300 also uses a flat bottom muffler, so you get a little more clearance and less turbulence under the car at speed.

Variants

• SKU: NVD-HS06HC2G3S | Body Style: Coupe | Tip: Polished Stainless, this is the Invidia Q300 Civic Si coupe setup if you want the classic Invidia Q300 polished tip Civic look.
• SKU: NVD-HS06HC2G3T | Body Style: Coupe | Tip: Titanium, same Civic Si coupe exhaust Q300 fitment, with the darker, burnt style Invidia Q300 titanium tip Civic finish.
• SKU: NVD-HS06HC4G3S | Body Style: Sedan | Tip: Polished Stainless, a true Invidia Q300 Civic Si sedan option, also commonly searched as Civic Si sedan exhaust Invidia or Civic Si Q300 polished exhaust.
• SKU: NVD-HS06HC4G3T | Body Style: Sedan | Tip: Titanium, your Civic Si Q300 titanium exhaust option if you want the sedan fitment with a louder looking, not louder sounding tip.