I was not satisfied with my Busa's performance until the first time I twisted the throttle with the turbo, I had installed all the normal N/A stuff pipe, power commander, air filter, several dyno pulls and adjustments all that work and money I got 10 - 12 HP, and other than the pipe that made some nice noise, I could not tell any diff in power, the biggest problem a Busa has when dealing with a good 1K is in about all the cases a Busa weighs a good 100lbs more......the Gen2 is a bit better power wise, but still in stock condition where a Busa shines is top speed, but on the street light to light I would go with 1K. now I know you said you did not intend to spend a fortune, but to get real power out of a Busa it will need some work, not a lot but definatly a little work, ether eng mods....cams, port work, pistons, some big power can be had in a N/A engine, but a turbo kit or nitrous will make more power for a ton less money the going N/A