i have a mig welder, what i do is make a mockup out of pvc, then i buy all the stainless steel tubing, then i just spot weld it with my mig welder so it holds it together, then i take it to a friends shop that tig welds. it cost about $100 total. that is with connections though, i would guess about 300 for anyone else, which still is not bad at all, then you could make a sweet side exhaust in one of the front fenders! this would actually be pretty tight on a honda! log manifolds work fine for street cars, if they are just using a t25 turbo that would probably be their best bet.

http://www.jgstools.com/turbo/

that place has very reasonable pricing. that is where i buy my flanges and wastegate actuators from.