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Have to agree with Sydneykid, this is not an easy or cheap thing to do, and you will not be happy with the results.

If you want a front entry plenum on your 25, get yourself a Greddy inlet manifold.

If you want the six throttle body induction, it is easier and probably cheaper to fit the whole GTR cylinder head complete.

im going to go with the greddy plenum for my neo rb25 when i get it... make things alot neater and reduce lag...

not really worried about performance gains - some top end torque would be nice but meh

- adz

Reduce lag? Changing the plenum will do nothing for turbo lag. If you are talking about "throttle response" then I think tou need to reread this;

To work out the throttle response difference the calculations are easy;

2500 cc X 5000 rpm / 2 (4 stroke) at 1.3 bar = 135 litres per second

So a saving of 1 litre represents less than 0.005 of a second

That's not a lot of lag to save with reduced pipework.

Then add in the extra volume of the Greddy plenum itself.............

Honestly spend the money on cams or something that will actually make more "top end torque". When you have bought all of the real improvement parts, by all means get a Greddy plenum. They are not a bad thing, bit there is much better value for money power upgrades to be had.

:D

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