5.0mustang5speed

here is my motor...347 ci..pro top line heads..rpm intake 750 holley..all msd..10.5-1 comprrssion..cam is .520 with 292 dr..the headers are full lenght 1-5/8 with 3 inch collector..should i get 2.5 inch or 3inch exaust system

fordguy17

3 inch. youre gonna be making lots of exhaust, plus it looks cooler

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8.804 @79.49 Stock motor aod car.
Totalled 2/8/08. RIP.
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roundman

for a small block like a 347 I would think a 2.5" exhaust would be plenty big enough after the collectors.

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retired and drag racing all I can now that I have the time!
13.533 @ 96.24 mph w/1.780 60', ALL THROTTLE, NO BOTTLE! 13.557 @ 98.24 mph most recentl

Obsol3te

Not too positive but you may lose power going with pipeing that big.

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R331 Stroker @ 8.5:1

313RWHP 339RWTQ (N/A)
423RWHP 518RWTQ (N20)