The exhaust was extremely easy to install and emits a deep throaty sound. I would not recommend the DB killer quiet insert. The quiet insert works! But too well for me. From the deep, clean noise that this exhaust makes, the quiet insert makes a HUGE decrease in the sound. This means its more of a quiet swoosh than a grumble. I immediately took the quiet insert out after one long ride and I’m in love with the sound of the bare exhaust.
After my crash on my 2016 R6 I had my mechanic install my M4 GP on it. The increase was very noticeable and it’s makes my bike a whole new beast!
I purchased the M4 GP slip on for my 2018 GSXS-1000 in hopes of improving the sound of the bike. The sound did not increase. However, the M4 GP slip on looks phenomenal!
My wife bought this slip on because I didnt want to get crazy with air/fuel adjustments of a full exhaust system, had to get a power commander and have to dyno the bike. It brings out the GROWL at low rpms and idle but it isnt loud with the cat and baffle in. It's a perfect tone in my opinion. I would've rated 5 stars but my slip on wouldnt seat all the way to the factory cat. I removed the ring seal for the stock exhaust as the instructions said but I still couldnt get it to seat against the CAT. I clamped the h*ll out of the clamp provided and used the spring tensioner and it doesnt leak, I would have just preferred it seated against the stock CAT to make it truly look that it belongs.
Super easy to install. Looks very clean with factory heat shield. Good sound, but not overly loud since it keeps the factory resonator.
Installed on 2017 CBR 1000RR. Easy installation, great fit and it sounds awesome. Also added some power on the top end. It sounds moto gp like on the go pro. Make sure you get the servo buddy as this upgrade eliminates the need for the exhaust servo. Do not hook the battery back up until the servo eliminator is connected. Install takes less than 2 hours start to finish.
Sounds great and looks great on my 2018 ZX6R
I will just say this! Since I installed this slip on It feels like I just bought new bike! It sounds GREAT and I feel more power that bike produces! Only regret is that I didn’t do it sooner! But, be aware! It is loud and on longer rides you might want consider earplugs! It is true GP!