RPM loss after swap from MBRP to SLP can

[Danbot]

Just like the title states, I was running the blown out MBRP after all my gearing clutching changes this year and she was running right at 7650 and crisp right from idle up. I (and my friends) got sick of the noise, so I put an SLP can on it, now it runs at about 7400 and "feels" a little less crisp down low.
This is all local riding at the same elevation (4 - 5k') in very similar temps.

So my first question is, has anyone else seen these results? I would guess this is an indication of the difference in back pressure between the 2 cans, and going by the theory that more back pressure is beneficial at higher elevation?, I should probably just clutch according to the SLP can and go with it seeing as though I do spend a fair bit of time riding 6 - 8k' when we load up and go riding in BC. I picked up some 10-68's which should get me back up to 7600.
Opinions?

 

[BIGGDAWG]

Dan,

i saw the samething going from the slp can to the cpi can i have now. that is why i switched.

i now have less heat. a little more power and the sled just feels more crisp. it feels even more crisp now that it is a 975 and running good

 

[guidoxpress]

^^DITTO..

i had the SLP can and now have a CPI can..WAY better..dump the SLP, get a CPI stinger can or use your MBRP again...worth the complaining from your buddies...thats why you need to stay ahead of them...so they hear it more and suck your roost tail

 

[Danbot]

Ok, good to hear its not just me... the 9 obviously likes the lower back pressure of a stinger style can. I guess the boys will have to start wearing ear plugs lol. Thanks for the replies guys!

 

[Danbot]

Dropped from 10-70 weights to 10-68's to try and compensate for the rpm loss, not impressed at all. Running rpm ended up being too high, and it still felt doggy all over. I hate this can, it's coming off before I ride again and wont be going back on. Until I find a better solution the noisy mbrp is what I will run.

Cheers, keep the rubber side down
Dan