I know that the 1999.5 and the 2001 maxima's use the same y-pipe. Does this mean that they have the same engine? My 1999.5 federal emissions engine has died and I found a used 1997 engine for a decent price, I just wanna make sure it'll work or if I should look for a 1999.5- 2001 engine. Thanks.

 

No, the 2000 - 2001 engine is very different than the 4th gen engine.

 

Thanks, do you think the 97 engine will work with my 99.5?

 

yes

 

Thanks y'all it's actually from a 97 Infiniti i30. I guess I'll get it. Do you think I'll have problems fitting the y-pipe?

 

Yer ECU will go crazy looking for inputs from your soon-to-be missing O2 sensors, will have a hell of time operating your swish valves (they won't exist either) and I found out that the "undefined" ECU codes we get with the 99.5 are for NATS (Nissan Anti-Theft System, standard in all 99.5 Maximas regardless of trim level)- another component that may go AWOL with yer engine swap... think this one over carefully...

 

Very important to consider..... It's the immobilizer system. IF you screw this up, you will have to visit your local dealer to get it fixed. They'll have to reprogram/replace your ECU and keys.

 

It will work BUT you will have to swap the following from your 99.5 engine to the new 97 engine:
1) Intake manifold (upper and lower parts) as well as all the stuff bolted to the upper intake manifold (IAC idle air valve assembly, canister purge control valve, etc)
2) Front exhaust manifold with integrated pre-catalytic converters

Why? The 99/99.5's use a swirl valves in the lower manifold unit that the 97 engine does not as well as a different style canister purge control valve and different pre-cat configuration (front manifold has integrated pre-cat). You need these items to be compatible with your 99.5 engine computer.