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Old 12-19-2009, 04:52 AM
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fastd fastd is offline
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Join Date: Sep 2008
Location: Austin, TX
Cobra Make, Engine: ERA FIA, 351W
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tkb289,

You are correct, sir. Actually needed to put a 2" piece of 2.5" pipe at the exit outlet to clear the frame; then welded the 3" tips on. the hanger is attached near the exit outlet. the exhaust is in there very snuggly, and the system is so short as compared to previously, that I know it will stay in there good.

Will try to snap some underneath pictures and post. Good luck with the rest of your build.

Based on my experience, I would say that it would be very difficult to get more than 2.5" diameter pipe and exhaust to fit under an ERA FIA. The Flo-Pro muffler I had installed was nearly 1" wider and taller (same length). My guy spent a lot of time and care (he had to cut nearly all of the outlet nipples); I am not qualified to say this, but I think he is an artist. I think a 2.25" would fit a lot easier but flows a lot less.
According to an article I found on the internet, 2", 2.25", & 2.5" straight pipes flow at 283, 365, and 521 cfm, respectively. If you go with some custom, "after" ERA market exhaust, I think you really need to check the cfm rating on anything that you install to make sure you find something that flows right. I have found that there is a huge disparity in flow rates across mufflers of the same size and similar construction. My 2.5" Flo-Pro exhausts flow 480-500 cfm; so together I am getting 960-1000 cfm through my exhaust; based on my engine size and horsepower, I have heard that this is a happy medium between the lower and upper rpm performance. Good luck and keep posting your pictures also.
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