S4 and S5 turbo
 

This turbo I have says HT18S-2S Is this S4 or 5 ?

Thanks

S5

yup S5
you can tell for sure by looking at the waste gate flapper door if it has tow round parts = S5, one = S4.

Jeffrey

Is there anyway to tell the difference without pulling it out?

straight wastegate rod = s4
wastegate rod that's bent = s5

Thank you