again yhere are noboddy there can help with tuning the sierra DOHC engine.. dont worry, it have been done.expect arraund 170-200bhp. the cheapest way to doo it are. kompressor Intercooler, standart engine, with the new model headgasket.(you can go op till 0,4-0,5 bars on std engine) some pipe work and hoses, and bay a SMT6 piggybag or a more expensive ECU. you need 4 new injectores or 4 more. std injectores can max give 150bhp when its with boost.

http://www.vae.dk/index.php?id=230

there are some more small bits and pices, but here in DK you can build a engine like that for abaut 1-2000 punds depending on how mutch u want to doo abaut it.

the car on the pictures have a ROOTS SC16 toyota compressor, and they are giving 0,45bars on a dohc engine with std wheels. and it have a spicial feture, you can turn it off. it are having at kobling like a aircon. so you can turn it off. and its werry cheap. but the dohc are driving with a mapsensor. so you have to close the hose when there are boost on. but that is werry simple and cheap. on the brakes vaccum line there are a thing (i really dont know the name in english) but is making sure that air only are gowing one way . you need some of these(1-2). and putt them on the hose. there are proberly somthing i forgot. and somthing you dont understand(bad english, sorry) but the DOHC engine are good for tuning.