Those maybe OK. I think they are conventional mufflers, but have deflectors that direct the flow around the corners, rather than the tube just dumping into a chamber. The Magnaflows are a straight through perforated pipe, so they have very little restriction. Made like the old glasspacks, only they use a stainless steel mesh that doesn't burn out as easily.
_________________ Dave
The Flying Fortress '83 Revcon Prince 31' FWD 502 w/Howell/GM 16197427 ECM/Edelbrock MPFI,Thorley's & Magnaflows, 4L85E 4 speed, KoniFSD, Yes it is SOLD
FMCA F298817
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