the 16v will walk the floor with a 8 valve any day of the week in any degree of tune. With the right parts lightened and balanced and the air floor maximised you can squeeze 200bhp from a 16v lump. you might have to go up to 2 litre though. you'll be maxing out about 160-170bhp with the 8 valve lump.
and yes, please don't start a 16v vs 8v arguement. We all know the 16v is far superior.