Hi Julian:

Yes, it'll be a direct replacement if you decide not to keep your stock nozzle, but we'll have to charge shipping though. Otherwise, the nozzle is $50 plus shipping.

Concerning the RPM/thrust, one of my buddies has 2 sprints, one with a P-60se and another with K80, he says to match with P-60 he would have to dial down the RPM to 135k, and at 138k, a substantial difference felt.

So Mark, your request to tune it down to 13 lb., I'd start with 135k first, hope this helps,

Regards,
Barry