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The Terminator
Exhaust
Does a 3" catback really make any difference over a 2.5"?
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<blockquote data-quote="PWORLDSTANG" data-source="post: 14558262" data-attributes="member: 49424"><p>With the larger exhaust, the best we have to go off of is when rtusnake swapped to a full 1 7/8'' primary and 3'' diameter throughout exhaust and gained 80RWHP and 9MPH at the track. But he also replaced his clutch, swapped over to a tubular K-Member, and had much more favorable track conditions after the swap. It would have made of a hell of a comparison if testing was more controlled, but I don't think that was his goal as he just shared his experience.</p><p></p><p>The trend for a few years now has been that larger exhaust (larger diameter primaries on headers, and 3'' diameter throughout) is better for 'xxx' horsepower or 'xx' lbs of boost. However, I have yet to see any definitive testing proving so. Until I see something more concrete I've chosen to stick with 1 5/8'' and 2 1/2'' exhaust throughout. While it sounds small for how much power some of us is running through it, it's tried and true as far as I'm concerned. I picked up over 15RWHP with Mac headers and I remember a noticeable seat of the pants increase way back when I swapped out my stock mid-pipe and cat-back before I got it tuned.</p></blockquote><p></p>
[QUOTE="PWORLDSTANG, post: 14558262, member: 49424"] With the larger exhaust, the best we have to go off of is when rtusnake swapped to a full 1 7/8'' primary and 3'' diameter throughout exhaust and gained 80RWHP and 9MPH at the track. But he also replaced his clutch, swapped over to a tubular K-Member, and had much more favorable track conditions after the swap. It would have made of a hell of a comparison if testing was more controlled, but I don't think that was his goal as he just shared his experience. The trend for a few years now has been that larger exhaust (larger diameter primaries on headers, and 3'' diameter throughout) is better for 'xxx' horsepower or 'xx' lbs of boost. However, I have yet to see any definitive testing proving so. Until I see something more concrete I've chosen to stick with 1 5/8'' and 2 1/2'' exhaust throughout. While it sounds small for how much power some of us is running through it, it's tried and true as far as I'm concerned. I picked up over 15RWHP with Mac headers and I remember a noticeable seat of the pants increase way back when I swapped out my stock mid-pipe and cat-back before I got it tuned. [/QUOTE]
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Exhaust
Does a 3" catback really make any difference over a 2.5"?
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