Cheers will do 
Am i right in thinking there is a limiter on the Elite as well,
May as well get all the dumb "Q's" out of the way in one go 
Plus better explain I'm a older guy not a youngster,so any performance gains neeed to be stealthy LOL,don't want to let everyone know I'm coming from 10 miles away 8-)
The only reasonably cheap thing to do is the chip, about £160. Improves top end, increases drivability mid range. Gains aren't huge, remember, normally aspirated, so not huge amount can be done from mapping point of view.
The manifolds are restrictive, but yet to find decent replacements. Not convinced decatting will improve matters much.
Silly induction systems seem to lower performance, but increase noise - so sounds like you won't want to go down that route.
Lastly, check your existing multirams are working. Fairly common for a problem with these, and they will affect performance.
BTW, no limiters on Omegas (other than the redline rev limiter).