Piston Upgrades

How do I go about upgrading the pistons in my 420A since most aftermarket pistons are larger than the stock bore width? Who does this and how much will it cost?

...or...

Are there aftermarket pistons out there that will fit into a 420A w/out any mods and yet be strong enough for a 10+psi turbo kit?

Whenever you do a rebuild, you bore and hone the cylinders, so if it was your first rebuild you would probably bore .020 over, and get .020 over pistons.

Stock motor can handle low boost depending on the turbo. Please learn what you're talking about before you ask questions about things you will never do. 10 psi means absolutely nothing, it depends on the turbo.

Turbo your RS the same way everyone else does, by learning exactly how from the guides already out there. One is stickied on this forum, 2gnt.com is also a good site.

and how would I go about getting the motor bored and honed, and how much would it cost?

If you don't know, you'll be bringing the car to a shop. They can tell you exactly what you'll want, because I don't know N/T's.