Have a BA GT-P with cat back twin exhaust, growler cold air.
Had the tensioners done about 3 months ago and if known would have done oil pump gears for peace of mind if I decide to fit underdrives.
Not sure about underdrives yet but will do it if it gives me down low go - is it worth it?

But want to give it a good tune, therefore

Which one do you go for? Sniper, CAPA, X3 etc etc
At present motor is 305-310kw