V4 with the stocker or mildly upgraded turbo.
You get nasty turbo surging sometimes with a front mount part throttle and smaller turbo.
You don't need a front mount.
Just my .02.
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WE4, 140K, Daily Driver, PTE51, 43lb. Bosch, THDP hollow cat., Postons Headers, 2 1/2"SS Ultraflows and pipes, 16 pos. Maxeffort thumbwheel 20*, EGT/Bilsteins, Boxed Cont. arms/Airbags/snubber,Blizzak snows, Nittos DR, 307, adj.reg./ SMC alky, 9 gauges,scamaster and D.Scan,BSTC, translator and 31/2"MAF, V4 inter. DYNO. TESTED!!!: 356RWHP 529ft.lb. Torque PROVEN!!!
GN loaded, car #2. 112K miles. Accufab reg. 160stat.,Scanmaster, Reds 93 chip, Mease downpipe, hollow cat., stock muff., SMC alky., J.J. 62mm.T.B., RJC power plate, Bilsteins, Moog springs, HR Parts mount and rear arms, Nittos.