will modded 1.9's hold just as well or close to the quality of what stock is? and anyone have expirience with the modded ones? im looking to order these tomorrow just trying to get opinions. 3.4 pulley, custom tune, headers, catback, 104's, 180* tstat, open cone, hydaulic lifters, comp push rods and 1.9rr is what will be installed when its all said and done.