Ok guys.
Got my car tuned yesterday with the Power FC.
Before with the standard computer I was having bad miss problems.. (known as cracks in the coil packs)
I fixed it for a while but then came back.
Anyway. Got car tuned and is running sweet. No misses.. and still the same coil packs.
I had a chat to the tuner about them. He was saying alot of ppl think its the coil packs, but really its a mixture of the standard computer + standard coil packs + non genuine spark plugs.
So anyway I was glad I didnt buy Splitfire's and for anyone who is worried about there coils a new computer should sort out the problem.
Cheers.