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Originally Posted by bremillard
I've got a 540 Chevy motor that engine dynoed at over 700 h.p. When I installed it in my car using Shell Valley supplied sidepipes the motor would barely run. I cut open the sidepipes and removed everything. I welded in some 3 1/2" CarChemestry baffles and welded the sidepipes back together. This mod allows the motor to breathe but it is much noisier. There really is no free lunch with mufflers. It will either flow real well and be noisy or not flow as well and be quieter. Each person has to weigh what is right for them. I opted for maximizing power in my application. -Bob
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Bob,
There are some hi-flow (straight-through, non louvered, non-baffle type) sidepipe muffler designs that are quieter than others at lower rpms purely based on entry/exit chamber design, length, etc. My previous factory pipes were much louder at lower rpms, and 30% less freeflow as compared to my current ones; so it in fact was not a give-take situation for me.
Which mufflers/cores did you choose from Car Chemistry, I see mostly baffle design inserts on their website?