Firstly I apologize for asking what is probably a repeated question but the entire forum for me on my current desktop isn't letting me view posted threads when I click on them which is a problem I am trying to fix but until I fix it I wanted to at least try and see if I could get some info on this anyway. My car is a 02 VX series II S with the L67 motor and just 135k K's on it. Everything is stock apart from a twin 2.5 inch exhaust with rear resonator. I do the engine oil/filter every 10k, and the transmission oil/filter every 30k and only use 98 octane fuel. I plan to buy a K&N filter for it, one of those $90 ones from supercheap auto. As well as a set of those Topgun leads I think they are called, and some decent sparkplugs that were around $70 for 6. Just wondering if my car (after the above paragraph of things included) would be in an appropriate state to handle a mace 10psi pulley on it? I don't flog my car at all apart from giving 2nd/3rd a prolonged wind-out once or twice a day, and prefer cruising around everywhere just using torque. It's not uncommon for myself to get 600k's from a tank over the last year at least. So yeah, I am just really hesitant as to if I should do this or not, would maybe a 8psi kit be fine instead, or 9psi? I don't know hey pls fill me in if you can help me out please cheers.