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Old 11-02-2012, 07:16 AM
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right size exhaust

got the Diamond Eye 3" down pipe, gutted the cat. Looking to upgrade my exhaust. Heard somewhere that anything over 4" cat back was useless. Plan on upgrading injectors at some point. Currently running Super Chips programmer. Should I stick with a 4" exhaust? is 5" exhaust really too much? Thanks
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Old 11-02-2012, 07:45 AM
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The 4" systems are more than enough to support most trucks. There is no real performance gain with a 5" system, just a deeper throatier sound. In the end, it's really up to you and your personal preference.

Let us know if we can help
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Old 11-02-2012, 04:12 PM
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I vote for 5", I have it and love the sound. Only downfalls of it is it is tight and have quite a bit of turbo whistle, but other than that it is awsome. 4" is fine to I just like the sound of 5".
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Old 11-06-2012, 08:27 AM
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3" DP and 4" exhaust here. no need for 5"
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Old 11-06-2012, 06:36 PM
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4 inch DP and 5 inch straight. Love it!
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Old 11-06-2012, 06:37 PM
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I think 5 inch will lower exhaust temperature better than 4 inch but I'm not sure.
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