"We present to you the Signature single exit exhaust system for the GRC! 100% hand made in our shop in the USA 🇺🇸 using CP grade titanium. Each unit is Tig-welded and back purged. This system is a straight-through true 3” connecting at the factory midpipe and terminating out an RK Signature muffler with twin 3.5” center exit tips.
We’ve spent countless hours designing, driving, testing, re-designing, driving, testing, listening, weighing, and lastly welding this system to get it just right. We managed to pick up +9whp / +10wtq along the way! We think you will agree.
Where did we end up? Lightest possible weights at just over 10 pounds (10.3), complete with all hardware. Optimized sound brings a clean, deep, pure natural, vibrant tone out of your GRC. Aggressive growl when you want it, subtle and manageable at cruising and highway with the use of our tuned Helmholtz resonator option when you don’t want it.
By identifying the rpm range and hertz range of the ideal cruising speeds in 6th gear, we were able to build a Helmholtz resonator option to equalize your driving experience. What’s even better is that we did all of it by only sacrificing .4 of a pound!
Want a rear diffuser on your GRC for the added benefits of aero and downforce? We teamed up with Verus Engineering and designed our systems to easily clear their rear diffuser. (Purchase here - Verus Engineering Rear Diffuser - 2023+ GR Corolla)
But that’s not all! Every RK system is a modular system by design!
Want that extra growl but don’t want to buy a whole new exhaust? Want to change it up for your track day this next weekend? Every RK rear section will swap in with your RK front pipes. Simply swap out your Signature muffler or Track rear section. Swap in a driver exit muffler or Track setup and completely change the look and feel of your car!
An option only RK does!
Are we your one-exhaust-fits-all? We listen to the request, and we build the parts!"
RK Signature GRC Highlights
- CP grade construction
- Hand-made, tig-welded, and back-purged
- 100% made in-house in the USA
- Industry lightest offerings at 10.3lbs (Signature)
- Helmholtz resonator option for drone control (+.4lbs)
- +9whp / +10wtq
- Modular design with all RK systems
- True 3” construction
- RK Signature muffler
- RK 4” Single exit tip section laser engraved and hand-built
*NOTES*
- Bumper block-off plates are not included.
- This replaces the oem exhaust only. This does not include the turbo elbow or midpipe
- All systems are made to order. Systems are almost never in stock.
- Lead times can vary based on current order volume. Lead times on most exhaust systems are 6-10 weeks
- All whp and wtq numbers are not guaranteed. Results were achieved on the same dyno in 2wd dyno mode. Runs were done with the Signature drivers' exit, which is a similar design to the center exit.
