you can run 7 psi on standard rods/engine - but trust me do it properly mate....dont waste time and money on bodge jobs second hand bits....trust me from some one who has made some serious mistakes (but id rather rip my self off rather than some mechanic ripping me off lol)

Save your self alot of bother - i DIY forged/uprated my engine for less than £300 (pistons milled 0.2, rods strengthened and peen shotted arp bolts , uprated valve springs) and still going fine after 20,000 miles.but what i found after discussing with serious tuners is that is NOT the way to go and a lot of people on here will say the same thing!.

Doesn't sound right does it? Do yourself a favour just buy the bits slowly build the engine in your kitchen then jutst whack it in! You can buy focus rs mk1pistons from burtons,, theres loads of con rods out there to choose from