You cant really build a junkyard turbo kit and get dyno tuned for $500.
For $500 bucks the best power combo I can think of is upping the compression (mill the head or thinner h/g) and a chipped p28 and hit the dyno, seeing as how you have basic stuff already.
The jdm d15b head/cam setup is pretty good from the factory. Obviously thats no where near boosted power but far more likely for $500.
For example >
Bisimoto Header
stock jdm D15b head
D16a6 sleeved bore to 78mm.
cometic 80 thousands thick headgasket
stock jdm d15b cam
stock z6 intake manifold
stock ignition
no exhaust
s300
151 whp, 128 ft/lbs tq
This build has a little on yours. (displacement + bisi header)






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