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I know this is most likely not possible for you guys in the US. but in Sweden there was a couple of guys working with the stock 2,1 WBX, still watercooled.
They intalled another Solid cam, did some head work and modified the stock F.I. - They got a tad over 140 hp and some serius torque. This was with 10-1 CR (MJ) engine.
But the stock engine pays reasonably good for 1 - 1,25 ratio rockers. (Also the 1,9) Bottom end is normally the same. Extra power starts to come in about 2800 - 3000 rpm. Expect about + 5% and better upper end torque compared to stock.
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