From what i have heard theyre awsome. But i wouldnt attempt to grind the interior myself. You could probably have it done at a machine shop on the cheap. By the way bDekle, finally broke a buck and a quarter a pound on calves...first time since last July. Even had one go for 1.55 lb.
well.... i dam neer stole mine.. and if i were to do it again, i wouldnt...
atleast for a mostly stock truck. for guys with large turbos that are laggy, it helps.... i saw less than 5hp peek diferance, down low, it did make a decent diferance before the truck comes on the boost.
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