There is much debate in this. I have searched many times to find no definate answer. But, after talking with various reputable members of the starlet community, I would bracket the absolute maximum between 230-250 bhp on a healthy stock engine. Bear in mind that Glanza rods are thinner than Gt rods so will fail sooner. A lot of it is dependant on the tune of both the fueling and ignition, but also its very important to have a healthy engine. You would have to thoroughly test your engine for faults or problems before running around the 250 mark, even then you could be going a little too far. 200 bhp is perfectly achieveable and with a safe tune will run pretty reliably for a long period of time as long as things are kept an eye on! Running this kind of power brings in wear and tear problems sooner, such as head gasket leakage and other oil leaks etc.