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Discussion Starter · #1 ·
hey guys...my headers at the collector are 3" dia. The collector going to the street exhaust reduces immediately to 2 1/2. I am planning on putting a 90 elbow of the header and run to just behind the front wheel. Would having a 3" elbow to the dump be right? or should I follow suit with the 21/2? I am going to the track and was planning to run open dumps for my runs. I am going to connect and reduce pipe dia. to 2" for my street exhaust. Thanks in advance
 

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Unless your engine is highly modified, a 2.5" would be more than adequate to handle the power and flow. My fenderwell headers have 2.5" collectors into 2.5" exhaust system, and work great. I do notice when the collectors are open that I have better flow vs. closed, as I have a hard 90 into the closed system. My engine idle speed actually picks up when the collectors are open.
 

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Discussion Starter · #3 ·
Thanks Vall, Want to approach this thing correctly...as always, it's great to be able to tap into experience.
 
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