Car with Meth/tune vs. same car with Meth/tune/DP is quite a difference and if you dont believe me try to run your car against a full bolts ons car. The non constrained DP's allow the Turbos to spool faster and gain up to 20hp to the wheels (or more with a full exhaust system) but depends if you buy cheap crappy one's or not. I guess it all depends if you want the max performance out of your car or not.
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An ounce of performance is worth pounds of promises.
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