1) $150 to straighten a wheel is about right, a little high but not bad for a dealer (Assuming the 328 are on stock 16's) Doesn't really matter if you have cheap rims or not.
2) $294 for an alignment is just plain robbing you
Also, highly doubt your valves are dirty, esp when you're using top tier gas like Shell. Next time grab the techron at walmart, it's like 10 bucks and treats up to 20 gallons, not the regular 12 gallon
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