Can anyone reccomend some good ht leads for my turbo?

It was tuned at TOTD but had now developed a misfire when it goes over 12psi of boost mainly in 3rd 4th and 5th gears.

Its got standard ford plugs in that are less than 1000miles old brand new distributor rotor arm and cap. so thinking its the HT leads as they are getting on abit and were from my 3i of old.