ANyone know if there was a change in design on lower plenums from 03-04 to 05-06 models?

Reason why i am asking is that i got motordyne plenum spacer and i have to say i didnt notice any gains So i'm thinking if the 03-04 plenums will help out my 05.

I know the 6MT new motor benefits from the swap, just wanted to know if the 5at does as well.

 

03-06 on the 5AT coupes = No change

 

is there a difference in the design between the 5at vs the 6mt plenum?

because the pictures i've seen seem to show 2 different designs in plenums.
as per motordyne website? or is that only on 6mt

 

Yes on 05+ 6mt (reved up motor only)

 

hmmm... i'm trying to figure out.. why did my power band is not the same as it use to be prior to plenum install.

 

The 03 - 04 plenum is the same for the 6spd and 5AT. The 05 - 06 plenum will give you a small increase in top end horsepower, but at a significant drop in torque. I've tried it and do not recommend it.

it might be a good idea for FI, but I haven't tested it yet.