Brass actually has better heat dissipation characteristics than aluminum, and 4- 3/8" tubes will cool faster than 2- 1" tubes due to less volume per tube. Aluminums biggest advantage is the weight savings.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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