The spool itself is what breaks. I've seen a couple. They just don't have the stregth. 4wheel drive places don't even recommend them behind Toyota 4 cylinder trucks. Talk about something with no power. Anyway save your money.
CHS 378 cid LS, CHS stage 3 ported 317's.
CBR Performance twin kit with Turbonetics ball bearing 6165's
1026 rwhp 896 lbs torque @17 lbs.