narrowing IRS trailing arms..HotVws article?

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Like i said the arms i narrow are for Porsche Speedster replicas, it allows wider rims and tires to be fitted. I can also narrow them less than 20mm as my jig allows me to set it at any distance upto 20mm. We get the driveshafts shortened by a place who specialises in rebuilding driveshafts. I would think you would be looking at least 400-450 but i cant be sure without checking on the postage.