Just thought some the Martin fans would like to hear this. I've got a 1984 Model Martin Firecat. I took the limbs, cables and string off and replaced them with 16" straight (8M) limbs, Nitrous B cams, and Nitrous string kit. Now pulling 67lbs, shooting 349 grain arrow, and 273fps. I'm happy. Thats with trophy hunter fall away rest, D loop, string leeches, limb savers, and Keller pendulum sight. That's about 50fps faster than the old bow has ever shot before. I'm sure Crachers could probably get 300fps but I'm not up to that level yet Don't have any pics to show but take my word it shooting one heck of alot better than it used too. Still having fun!! May go to the Nitrous X system next All you Martin fans have a good one.