It's come to my attention that some or many are seeking performance upgrades for their bikes so I'd like to share my discovery and encourage others to do the same.

There's a highlifter lift kit available but not truly fit for the U.S. model(Front bracket doesn't sit flush on the A-Arm). https://www.ebay.com/itm/274448411060  I'm running it ATM and have zero issues after 3 days of rough MS riding.(hope to fabricate a better fit in the fall) Advertised 1.5" but truly adds an inch of ground clearance. Rear hub simply flips on that bike to lift the rear an inch.
Airdam Clutches has a clutch kit http://airdamclutches.com/clutches/cfmoto/# , available from https://www.mainstreetcycle.com/

If you're interested in exhaust, check out whiskey bent tips https://whiskeybentmetalworxandmotorsports.com/shop/ols/products/xn-c-force-performance-exhaust-tip-90-degree-cf-moto-cfmoto-cforce/v/XN-C-FRC-PRF1-1-5 or an RJWC exhaust is available for the 400. https://invidious.tube/watch?v=J1-FAPdwurY

Also, there's a warrior risers snorkel kit available, https://www.snorkelyouratv.com/product-page/sya-warrior-riser-snorkel-kit-for-cfmoto-cforce-400-500-2016-2020

What you'll find is that there's one, possibly two manufacturers for any mod you look into and most are in the Euro or Canadian market but they're out there. 

There's a local shop (MSC in Tishomingo, MS https://www.mainstreetcycle.com/shopping/item/10/LIFTKITFREESHIPPING) listing a 2" kit from a Canadian manufacturer, Perfex https://perfexind.com/collections/cforce Although the manufacturer lists it as a 600 kit, MSC currently shows it available for my 400 (unless they're passing off the highlifter 1.5" kit via the listing) I'll update as I gather more info from MSC.

Anyone using a Dr. Pulley weight/slider on their Primary w successful performance improvement?

[2015 Z Force 800 53/Trail EPS]

Anyone using a Dr. Pulley weight/slider on their Primary w successful performance improvement?

I have. Very noticeable. Not only do they slide better and react to shifting needs and back shifts faster, but the range is a little better which means for us with wet clutches, a hair lower ratio on take offs and a little farther to full shift-out which a hair more top end. Yeah...worth it. I'll never go back to the rollers.

Anyone using a Dr. Pulley weight/slider on their Primary w successful performance improvement?

I have. Very noticeable. Not only do they slide better and react to shifting needs and back shifts faster, but the range is a little better which means for us with wet clutches, a hair lower ratio on take offs and a little farther to full shift-out which a hair more top end. Yeah...worth it. I'll never go back to the rollers.

I'm having a difficult time finding the proper slider. Any idea what fits the primary on the '21 400S?

[2015 Z Force 800 53/Trail EPS]

Anyone using a Dr. Pulley weight/slider on their Primary w successful performance improvement?

I have. Very noticeable. Not only do they slide better and react to shifting needs and back shifts faster, but the range is a little better which means for us with wet clutches, a hair lower ratio on take offs and a little farther to full shift-out which a hair more top end. Yeah...worth it. I'll never go back to the rollers.

I'm having a difficult time finding the proper slider. Any idea what fits the primary on the '21 400S?

Pretty sure they don't make sliders for your type of clutch. Only for the ones with rollers. You can change the weights and the spring though and have near the same effect.

Ok. The only kit I've found is the Airdam kit and Mainstreet Cycle(only retailer I've found) is currently out of stock. I toasted the belt over the Memorial Day holiday after trying to pull a buddy out of MS sticky icky following 2-3 weeks without rain. I'm set to replace the belt and reclock the secondary.

That event, my 26" tire upgrade and my need for speed out of corners was more than the stock belt was ready for over 3 days. 

Best performance mod I did was remove the throttle stop that was cast into the throttle body.

I've posted about it before, but fresh off the lot, when I removed the throttle tube, the butterfly would only about about 30%. There was a tab cast into the throttle body that limited how far it would open.

I reached under there and broke that tab off with a pair of needle nose pliers. Totally different bike, it was not terrible before, but not great either. I hit 58 mph (indicated, not sure how accurate) on flat ground the other day.

My machine is a 2020 US model Cforce 400. I don't know if it's only US models, or certain years that have the limiter, but doing away with it was very worthwhile. My dealer would not do it themselves, but said they would still honor the warranty if I did it. Although my warranty just ran out.