Ignition Break down help

[leeroy_25]

I have just finished doing my single turbo conversion using a Holset turbo on my FD3 and I must say I am very pleased! The motor is on stock ports and so far made 300RWHP at 0.8bar boost. However I couldn\'t push past this as the ignition is breaking down at the top end and the tuner didn\'t want to run any more boost just yet. I only have standard BUR9EQ plugs in and standard ignition. The tunner recommended 10\'s for a start and an ignition amp. After a quote of around £130 for a set of plugs and £250GBP for an amp I thought I would do some searching online! I see a lot of people in the US recommend the NGK B10EGV and these are available dirt cheap. Anyone on here use these particular plugs or any other suggestions?
My next question is should I need an ignition amp?
Goal was 350-360RWHP with no more that 1.0 bar boost. Will the plugs hold out on there own for that or would I be better off with an amp too?
If so what options do I have? i.e I am looking for something cheaper than  Â£250GBP!
What is everyone using and do you need to run both lead and trail plugs through the amp?

Cheers
Lee