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A tuner shop dyno'd the AR dp's with race cats and generated insignificant gains over stock. With and without a tune. Would support the evidence that 1M has higher flow cats than 135i.
Don't ask me for graphs, or names, places and dates. I don't have them. I was considering getting the AR's and was advised to save my money. Coming from the tuner himself, that sells the product, made an impression on me.
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