Quote:
Originally Posted by Back4More
Once and for all, are the CMI E-tops or the Sport tubes netting any real speed gains?
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My 2 cents: 27 Fever, 66mph on Fountain performance report with stock engine and 24" prop.
When I bought her, the previous owner had her fitted with sport tubes and a labbed 26" prop.
Now good for 70mph, but I can't say how much is courtesy of the prop or the exhaust.
My guess is that neither - alone - could have given a 4mph improvement. So half and half, maybe?