Hi,
Most of the glasspacks that I've looked at have a couple things working
against them. First - the dimples usually extend into the gas path. That
means restriction. Second, most of them "neck down" internally restricting
the air flow.
"Good" turbo mufflers don't do this, so they flow better.
Glasspacks were "the balls" back in the day because they were cheap and
they met the min. requirement of a muffler. The current turbo-style
mufflers flow great and are pretty inexpensive (figure $40 to $60 for
name-brand mufflers, up to 20% less for "house brands" (like summit
racing). In our case, it's worth spending a bit more to get the quality
that some name-brand pieces offer. If you search around, you can even find
cheap turbo mufflers in stainless so they won't rust out. How kool is
that?
rml
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