Will Rb26 Fit Rb25?

[Charlie4401]

Hi guys I would just like to know if the GTR Plenum will fit a RB25???? if not dose any one know of any cheap aftermarket Plenums to fit a 25??????

[Deano45]

Hi guys I would just like to know if the GTR Plenum will fit a RB25???? if not dose any one know of any cheap aftermarket Plenums to fit a 25??????

Charlie, I would suggest you use the search function as both of these have been covered quite recently.

The multi throttle body rb26 plenum is not a direct bolt on fit but thge head can be modified to make it fit.

There are forward facing plenums that you can buy to replace the stock plenum. I remember reading a topic recently on someone who created a how to with photos on it.

[gotRICE?]

Going at it cheap isnt always a great option.

Even fitting the cheaper RB25 front facing plenums seems to be a hell of alot of work looking at a few DIY threads.

The RB26 option looks pretty costly. So dont bother

[skipppy_247]

greddy or blitz make an adapter for an rb26 plenum to fit onto an rb25 but for the price of it you can just get a greddy plenum

[Charlie4401]

ok thats cool thanks for the info guys....... I should have my car Turned on the 8 of July will post a few pics

[Phantom32]

have a look around on ebay - there are plenty of options for an aftermarket rb 25 plenum. You can modify the std plenum so that it is forward facing, however its not recommended to do so as the design of the std plenum with the intake in the middle is better for distributing air evenly into all the cylinders. By modifying it to be forward facing you will find that cylinders 5 and 6 will not get the same amount of air as cylinders 1 and 2, resulting in the AFR mixtures to be uneven and possibly resulting in long term damage to the motor.

Best option is to go a greddy or similar plenum, or any other brand, as long as it is tested for air flow and the design and workmanship is of an excellent grade with good quality joins and runners.

Keep us posted on what u end up getting and what sort of figures it makes and also whether having an aftermarket plenum makes a noticeable difference in the curve or driveability of the car.

Cheers mate

[Swiper the Fox]

charlie Plazmaman make a decent bolt-on RB25 plenumn...actually i have one off an engine i bought. PM me if your interested in it.

[Keeper]

don't buy an ebay jobby plenum if you dont trust it, we have had problems using them on RB25s before, missing fittings, leaks, poor quality