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Recent Toyota models seem to respond less to exhaust and intake mods, presumably as Toyota is doing a better job building them. That said, an intake and exhaust, properly designed, should see some improvement in mileage, at the expense of noise. A turbo won't suck any more fuel by itself. Now, if you take advantage of the power it will!
Now, best mods are subjective. A full intake, header and exhaust combo will gain you a little power (perhaps 5-10% more total). Coupled with some tuning using an SAFC and some time on the dyno with a wideband sensor, you may pick up a few more ponies.
Turbos are advanced mods, and will require a significant overhaul of the car, from the fuel system through to the exhaust and intake, and engine internals if you push them all too far. Yes, they offer a lot of bang for the buck, but a home brewed system is destined to give you problems if you are inexperienced with it. There is also the TRD supercharger kit that was made for the last generation Vitz/Yaris that may be an option...but again, significant mods. In my readings on some of the echo sites, anything pushing 150 or more HP is asking the NZ engines to grenade, even on modded internals. There may be a few success stories, but they are fairly rare.
Bob
Last edited by bgrieger; 05-22-2006 at 07:41 PM.
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