some people say that the ko4 doesnt give out enough power. idk how but anyway

what is th next step up from a KO4

and how reliable are they whatever turbo it is

 

Which Turbo should I get?

This all depends on how much power you want vs. reliability, and how deep your pockets are. The most reliable and easiest one to swap to is a k04-015. You don’t have to swap anything else out. It’s a direct bolt on replacement. But you’re probably going to max out a little under 300hp. The other popular choices are GT28RS, GT2871r, and GT3071r. With a gt28rs you will get more power but you will have to swap a bunch of stuff out as well. It maxes out around 350-375 hp I believe. A gt2871r is going to provide similar results to the gt28rs. The only difference is the gt28rs will spool faster. If you want even more power go with a GT3071R. It maxes out at about mid 400 hp range, I believe. Again you will have to change other stuff as well. If you want detailed info on these three turbos, then check out this link: http://www.atpturbo.com/root/releases/release050304.htm

There are others as well, but these are the popular choices.

 

Before you get a bigger turbo, I suggest you do general upgrades to your car -- IE a new exhaust system, new intake, fuel injectors, etc etc.

 

a ko4 will make at most 240-250BHP (not whp) with being pushed hard. If you want more than that, a gt2x elim is about the smallest upgrade that makes good power. I would rather go with a t3 60trim or gt28rs personally

 

+1 for the gt28rs, it seems eveyone with ko4 eventualy realizes they want more, and the gt28rs is the basic anwser. from stock too running a gt28rs you would mostlikely be putting aroun 3 grand into it. theres a kit from atp http://www.atpturbo.com/Merchant2/me...ory_Code=VVWTK. Yet after that you need the fmic and tuning. i hear its worth it though, and its what im saving up for.