I'm thinking you have better choices than these 2 cams. These Gen 2 motors have so much more potential. Check out that new Z cam from Fuel Moto that's meant for these new Gen motors. I would capitalize more on that 121's potential. I run a 480MT in my '23 107" and a 480 in my built '19 128.
Maybe I'm wrong though, maybe I need to get one of these new platforms and do my own experimenting!

 

I spent more than an hour on the phone with FuelMoto when I was buying their 2-1 Jackpot RTX for my 117 and found out these gen 2 M8's react extremely well with just a good exhaust and tune. They told me the a good exhaust and stage 1 tune nets nearly the same power as previous M8's with a cam. Moral of my story is check out FuelMoto's website because the posted dyno charts with Gen 2's in stock with enhanced tunes and with cams. I think you'll be shocked when you see what these gen 2's can achieve. I ended up doing the Arlen Ness air cleaner, FM's Jackpot RTX 2-1 and the PV4 on my 24 117 due to this dyno chart the published. I'm very pleased with the improvement and see no need to open the motor up for a cam but to each their own. Good luck

 

I did the leg work for you because I'm bored lol. These new motors react great when you eliminate the EPA restrictions. This a stock 121 vvt, with their new Ripsaw 2-1 and their RTX 2-1

 

I would think that a good tunner can gain alot of power with the vvt setup. Back before computers we would retard cam timing for low end power, and could advance cam timing for top end power. Different cars depending on how they were setup would like one over the other. Now we have tech that can do this on the road under power. Hopefully cams are being designed to use the tech. The computer should be able to adjust for economic cruising and turn up the power when you twist the throttle.

 

Maybe just decat the head pipe, change the air cleaner, and change the mufflers. This is my kids bike, 121VVT with the SE tuner.

ner.

 

I have the CR480MT - so far the best cam I have run. No dyno tune, just a power vision PV2B and tune from Fuel Moto; Stainless Steel FM headpipe and Khrome Werks mufflers.
Pretty smooth power throughout; I rarely go over 4K rpm.
Previously had the 475C and 22XE and TTS100 (not in that order).

 

This is what I was considering for my 121" before deciding to go larger displacement. I like squared numbers and this one comes on really early and carries way out. You should also look at the charts that @crazy4ink has put up with the Feuling cams on the 121". He's getting really good results with their combinations for little investment.

 

I like those numbers....I asked my builder / tuner if 140/140 was feasible and he said it was.

 

I was super impressed with that chart. This comes on so early and is flat for so long. The more I learn about T-Man the more impressed I am with their products as a whole. I know @BH#103 has had good experiences with them as well.

Like I said earlier, I like squared charts because that tells me that it is a good all purpose cam. This chart shows what I had on my 128" Limited where I was 148 squared (RedShift 552 cam). The blue line was when I ran the MHP-485 cam (same as Star 30/30) on the stock displacement and that was pretty close to being squared as well.

 

I looked at the Fueling Reaper cams, but the 538 and 521 require different valve springs. I did see a chart for the Woods 22XD that had the same parts I plan on using with the exception of 6.8 injectors and it made 145HP / 148 TQ

 

Mastertune (TTS195), George Brice (Star M28) , Zippers (534), and GMR(555) all report as 'bolt in' for the Gen 2 M8 engines.

 

Fueling 525, has great torque and a wide bandwidth, which is hard to beat!!
Compare this cam to the woods, and the Cycle Rama, Fuel Moto sells this 525 cam..... which in my honest opinion is better than the both of them. I run a fueling 572 has been the best cam I've ever run, but one thing about the fueling, is its wide range of rpms, with plenty of grunt, to get you to 5,000 RPMs,
At least check it out before you purchase, and good luck in your adventure,

 

I looked at the Fueling Reaper cams, but the 538 and 521 require different valve springs. I did see a chart for the Woods 22XD that had the same parts I plan on using with the exception of 6.8 injectors and it made 145HP / 148 TQ

@crazy4ink can correct me if I'm wrong, but the different valve springs would be if you had been running Gen 1 heads. Since you are a Gen 2 bike, you can go up to a 560 lift cam without worrying about coil binding.

Fueling 525, has great torque and a wide bandwidth, which is hard to beat!!

He's running the new Gen 2 M8 motor so that Feuling cam wouldn't work. I am really impressed with the results of Feuling cams though. Murph has been posting some killer stuff with the new bikes and them. I also just put their 543 camchest kit in my '05 Softail Deluxe. It may be costing me some on the bottom end with that little 88" motor, but damn if it doesn't have that killer lope.