i have had my 2.5 xforce exhust stright from the Cat installed a month back, My car HAS dropped power on low revs but on high revs it gains Shitloads.
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2005 holden commodore Vz need help on peformence
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Because the cap on the front and rear valve drives in the need for a ratchet handle or dead gas changes until engine speed pushes by a vehicle .