While surfing another group (alt.trucks.Chevy) I came across a conversation
about poor performance on a '82 S10. One issue came up about how the
aftermarket dual exhaust might be flowing with not enough backpressure for
the exhaust valves to operate correctly and causing the (or some of) the
Here are some snips:
By the way, one reader suggested to me in email that the aftermarket
dual exhaust (already on the truck when I bought it) could be causing
my performance problems. Apparently this V6 likes a certain amount of
backpressure on the exhaust valves in order to operate well, and my
dual exhaust (and lack of cats) could be providing too wide of a
pathway, thus lower pressure. I think I may pursue this and try
reverting to a factory exhaust system. Thank you, Rich!
Do yourself a favor and ignore Riches advice. The less backpressure your
engine has the better it will run.
What size are the pipes? Rich is partially right. That truck probably came
stock with a 2 1/4 single pipe. Its not that it needs back pressure, but
that it needs flow. A pipe that is too large will kill the flow-the velocity
of the exhaust going through it.(its hard to explain) It might be worth
to research it a little.
If we were talking about headers Rich could be right.... but we aren't
talking about headers. If it has dual 6" pipes all the way back from the
converter or even from the manifolds it isn't going to lose power because of
Oh, BTW, forgot to mention that I do not have catalytic converters.
The truck would have come factory with one, but I've never seen it.
Two 2" pipes all the way from the manifolds to the rear bumper.
As I am considering new exhaust for my '88 S10 Blazer, I wanted to know what
you guys thought.