crower rods have a greater tendency to strech then say eagle rods or manley. for the price go with eagle, great rods and affordable. for overall strength, manley, thee beastly and will take all the abuse u can throw at em. crower rods in my opinion are for mild to moderate power say around or under 400.
there alot stronger then stock and probably a bit heavier too. d-series rods are like toothpicks. check tunertoys.com and see if they still sell there brand rods, there made by the same company as SCAT, and there pretty good rods