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John911sc
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I used H&R 23mm wheel spacers on the rear only on my 05 CTT. You'll need to get longer lugs. I used them on my car with 22" wheels but they should work the same for you. I got them at allsprings.com.
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I had my ECU flashed by PowerChip, but wasn't that impressed. I researched the issue again and found that Upsolute promised the greatest gain in HP amongst the various tuners. I sent the ECU back to PowerChip, had it returned to stock and then had Upsolute do their thing. Amazing result, and definately worth the cost at $750. I just wish they had a module for the Cayenne TT that allows one to change directly from stock to mod like some of the other tuners do.