I habe a MTI B1 can and it came with K-Motion 750 spring and Ti retainers, should I use them of get teh 918's and use the stock retainers? or something else?

 

Throw them K motions in the trash! I broke 2 K motions springs with only 8,000 miles on them and replaced them with comp.918s with stock retainers. I had no valve float with the stock retainers on the 918s and did not drop the power curve any over 6200-6800rpm rev limiter by using stock retainers. Comp. now has the Titanium retainers now and i would get them if you have the extra money cause they will help more in the upper part of the power curve by releaving stress off the valve train.