Yes you will have to clean or replace the MAF sensor if you over oil your K & N.
Cosworth or HKS are my best sellers.
Both in stock and good to go same/next day.
Just drop me a PM if I can help you further.
You will find both the above and much more in my 10 page sub forum Zstore.
http://www.350z-uk.c...m/137-zmanalex/
Alex.