hahaha! vnt-15 at 1.65! that ain't gonna last long mate, constant max for the 15 is 1.2!
vnt-17 holds 1.6 constant stock on the 130's so it'll be ok,,, and btw, there is no dump valve and no wastegate on yout car.
you can search ebay for new and used vnt's, if you lose a bit of time waiting for the bargain you can get a cheap one. good luck.