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Your cart is empty.The flat bottom shaped muffler design results in improved high speed aerodynamic performance. The muffler inside contains continuous piping design and use of Advantex material that results in an excellent free-flow exhaust with optimized back pressure, giving greater horsepower, torque gains and a rich deep sporty sound. The use of SUS304 polished stainless steel piping, Mandrel bent to shape, state of the art CNC machine made flange, Robot TIG welding and double wall polished stainless steel or Titanium tips, provides outstanding durability and appearance.
richard
Reviewed in the United States on September 4, 2021
Will the 11-14 fit a 15-21 sti?
Ramon W. Acevedo
Reviewed in the United States on March 11, 2013
I recommend it, but the installation was a little tricky. I have a COBB down-pipe and this connection does not work with with original hardware. I had to install longer bolts between the down-pipe and this exhaust connection. After that it works great
tool_nut
Reviewed in the United States on June 9, 2012
I installed the Q300 on my 2011 STI sedan. Installation was almost seamless. The only glitch was mating the Cobb catted downpipe. Although the Cobb easily mated with the oem exhaust there was difficulty getting a leakproof seal at the flanges. The small leak was resolved after a helpful call to Invidia tech support. A substitute bolt was used and problem solved.We followed the advice of several people and did not tighten anything down until everything was in place and the tips were set exactly the way I wanted them. The end result was a really easy install. Less than an hour on the lift. Although others have told me you can do this job on jack stands I chose to find a real lift and get the car over my head. I can imagine it can be done on stands but why struggle.After install: The sound is exactly what I hoped for. Not too loud yet the boxer rumble is clearly there. I did not do a dyno before & after so I have no opinion on HP gains. I assume the exhaust flow is less restricted but I'm skeptical of Invidia's claim for 15+ more ponies. I would be happy with 5.Bottom line - competely satisfied!
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