Thread: SPF owners...anyone change sidepipe mufflers?
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Old 09-20-2000, 06:28 PM
Randall Thomas Randall Thomas is offline
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Join Date: Jun 1999
Cobra Make, Engine: Three Cobras, one 351W, one 427SO, one 527BB & one GT-40 427R
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I looked at my SPF (#729) and the I.D. of the muffler inside is considerably larger than the number you mentioned... around 2.400".

Maybe it's an earlier design (?)

I turn my big block easily in the 8,000 range with no apparent restriction.

THEORY: "bigger cubes- squashes more air thru smaller pipes". Yep, works for me ;-)

/Randall
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