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Old 06-27-2012, 11:23 AM   #1
Scooby Newbie
Member#: 291739
Join Date: Aug 2011
Location: Harrisonburg, VA
99 Impreza RS
Silver Milage

Default EJ20K swap to RS q's

My RS had a cheap cold air intake that I was going to mod to work as a short ram with the stock RS MAF sensor. Will this motor run okay on this MAF with a EJ20K ecu like the 4W or 2S?

Also, I'd like to have a 6S ECU, but I've heard it will have driveability issues without having the yellow top injectors and bigger MAF. Would it run okay with the grey tops and RS MAF sensor til I can get the EJ20K STI MAF?

Thanks for the help!
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Old 07-01-2012, 10:16 AM   #2
NASIOC Supporter
Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Austin, Texas, USA
The 93 W/EJ20K-sold
Subaru-less :(


99 rs maf and 3 plug ecu-

no it will not not at all iirc the 99 is a 5 wire the 20k is a 3 wire maf
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