I'd just like to know whether you guys have actually drove a TD04'd Starlet? I've had 3, and they are not laggy! That's what people used to think 4 years ago but I thought everyone knows by now that they don't lag. I say go TD04 for sure, it's an ideal sized all round turbo imo. It will absolutely wipe the floor with a CT9 on the straights, and will help you stick with bigger cars and I can't see any issues around the bends either. Once you learn how to use the turbo at its best efficiency, you can have the power there when you need it. Cost wise, I build my latest GT on a budget and here are the sums for the turbo kit: Toyosports Manifold and downpipe - £110 (unused) TD04 turbo - £60 Brace welded to the manifold for added support, and actuator bracket fabricated - £40 Race-tech oil feed - £30 Genuine Subaru gaskets (not essential) - £30 Braided water pipes - £40 That's a total of £310, you can use rubber water pipes and wrap them up, and use cheaper gaskets so it can be as little as £240.