Hi I like the look of the RD1992 much better than the 1990 I do have a AT and the 1992 is made for the 6mt. Will i see any perfomance degredation or fitment problems with doing this?

what is the difference between the RD1992 and the 1990?

2003 Blk/Blk Premium w/navigation
Tinted Windows
Chrome Wheels
BRM Catback Exhaust
Injen CAI
Unorthodox Crank Pulley (in garage)
Clear Corners
Grounding Wires
255/45ZR17's rear

RD 1990 is for Automatic Trans
RD 1992 is For 6MT Trans

GOT STICKERS?
CPV35 Driven BY David K, VQ35DEN Tuned By DR CHARLES
...........NismoCPV-35

I know that but will i see any performance difference using the two

You would see better performance with the RD1990 because it's is made specifically for your car!!!

Inside my shell, I wait and bleed

2003.5 Black/Black 5AT Fully Loaded w/ Navi
Clear Corners / Injen CAI

This is from a conversation I had with an Injen rep.

The (RD1990) intake will fit all other models of the G35 but when put on the dyno, we did not see the same gains as the Automatic. We were able to get more power with the RD1992 when used on a G35 manual transmission

03 Sedan ~ 5AT ~ aero ~ 19x8" Axis wheels ~ Garnet ~ premium ~ NISMO body kit ~ clear front corners ~ Stillen Cat-back ~ Injen CAI ~ Crawford plenum