The early ones like mine came with 18?lb units, later ones were like 24lb. MP/DC showed 24lb units which worked for many engines, Mopar/gm/ford etc and these were listed for the 2.2/2.5 turbo with 300hp upgrades. When I talked to a tech on the MP tech line, he gave me a pointer. Said to use the Ford Racing/Motorsport 24lb units as they were less expensive and have multiple spray holes, believe they are 4. OE Mopar units are 1, same with the MP units. Better atomization. 24's are fine for higher power upgrades but not sure when you need to go bigger. You'll need to do the math. Also at some point the injector type/connector changed to the thinner style. Don't remember when that happened.