Tuning the V6 engine

[kal-el]

Where can I find some useful websites for tuning the 2.5 and 3.0 Ltr noble engines?
Has anyone upgraded their engine to the same spec as the M400? Is it worth shelling out on tuning an older car, or is it better to just upgrade to a 3R or M400?

Thx

[alex s]

I have had some engine work done to mine, 52 plate 3. PM me if you want details.

[paulcundy]

I looked at this and found it cheaper to import a USA spec M400 engine than have my current one modded.
Regards
Paul C

[brav]

You can buy an M400 spec engine for under $4400USD, complete running engine without turbos. I learned this the hard way.

[washy]

brav said:

You can buy an M400 spec engine for under $4400USD, complete running engine without turbos. I learned this the hard way.

Is that a new unit or exchange or...