Quote:
Originally Posted by slaby  how were the performance gains? it didnt reduce the low end hp/torque did it? that is my main concern. my friend has a focus that he rally's and when he installed his headers it brought down his low end but gave a good increase in top end. | On my 2.5L I had solid gains all across the board TQ and HP with Corksports cat back and MSDS header... Graph is attached below.
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