im very confident in stock internal KA's. my current KA in my s14 has 245,000 on it. the last 2 previous owners used it as a drift car. they had it for about 3-5 to 4 years drifting the heck out of it. when i got it i just did all tune up stuff to it. i been beating the living hell out of it too. it holds up to everything you can throw at it. patterson runs shifting at redline flooring it, pretty much treating it like a fucking race car. lol. the only thats has gone wrong on it was a tiny vaccum leak. i honestly dont see how you can blow up a KA easily? lol i just keep up with maintence and it runs like a fucking brand new motor. idk