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We're about to put muffins on the 70 and were thinking about 3 in with stage 3 flowmasters (I think, bought em used) it's a 400 with trick flow heads, mild cam and 3:43's. I've heard that you can lose bottom end with big tubes because of poor scavenging. What do you guys think? All the specs are on our webpage. We just want components that work well together.
Thanks

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The ongoing saga of the MALIBRUISER 70 SS fake
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My .02
I've heard that exhaust sizing, has more to do with horsepower, than displacement, so I doubt 3" will hurt ya.
Think of all those dudes with 302 mustangs running 3" pipes.
By the way the website is rad.
I check it every few weeks ta check on da boyz progress.

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Hoffman, in the research I did designing my system your statement is correct BUT ONLY IN THE FIRST FEW FEET OF EXHAUST. Specifially the headers/manifolds. This is from experts in the exhaust field. The only thing about the 3" muffs is that they're loud and arguably, you probably dont need them given the mild cam. But they aint going to hurt ya ( as per Torque Tech, Mr. Gas, and Carl McQuillen Racing Engines.)
 
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