a t3 would be fine, you can make damn good power on a well zsized t3, and the downpipe depends on your turbo patern, its usually either a 5 bolt if the turbo is from turbonetics or its a garret turbo modified by turbonetics and usually a 4 bolt if its a garret turbo ordered directly from garret........and prince hondatas can be cheap take for instance a program used for all motor cars like scotts, his hondata is like 300 bucks, maybe even cheaper, but for boosted cars its around 590,thats the last time i checked and im sure the prices have just went up.....