I am personally running the test pipe and it did throw a CEL I havent got around to trying to fix that yet, I def. know for a fact tho that the header will deffinatly help out allot, upon taking off the secondary cat to install the test pipe I was staring at the stock header for about fifteen minutes during the install and man does it look restrictive. I would def. like to purchase the header sometime soon..
Btw the hardest part of the install was getting the bolts off, all I did was use a bit of pvc pipe laying around to get more length on the tool and a bit of muscle lol but ya it did help out a bit.
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I hooked up my accelerator pedal in my car to my brake lights. I hit the gas, people behind me stop, and I'm gone.
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