hi m8. ive got a zs aswell. i put a puma engine in mine last year.

ive got a 4-2-1 manifold and full system and panel filter.

the best engine to go for is the puma 1.7. its the easyist to fit. it uses the same engine mount locations and u can still use the zs gearbox and driveshafts. just change the wiring loom and ecu.

i fitted mine myself and im not a mechanic thats how easy it is plus i saved around 1k on labour charges.

defo the best to go for