myGspot

iTrader: (1)

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.

SilverII

03-06 on the 5AT coupes = No change

myGspot

iTrader: (1)

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

SilverII

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

myGspot

iTrader: (1)

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.

z327

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.