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· Dr Wheelspin Rh.D.
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4,299 Posts
HKS 3000 pipe is definitely superior for flow, the stock 3000 pipe can almost fit inside the HKS pipe. I personally wouldn't waste time polishing the stock 3000 pipe, it's a major bottleneck which should be removed.
 

· Dr Wheelspin Rh.D.
Joined
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4,299 Posts
suprakikdurass said:
Couldn't you just remove the restriction where the 3000 pipe bottlenecks? It's 2.5 inches in diameter going into the throttle body.
You could, but the HKS 3000 pipe would still be bigger. The stock 3000 pipe at it's largest point isn't as big as the HKS 3000. If my HKS 3000 pipe hadn't come with my HKS IC kit I would have simply made my own 3000 pipe.
 
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