dual exhaust question

On V-6s, is there any reason not to have duals on each side straight on
back, no crossover? It'd be a 3 / 3 split, one pipe off each manifold.
Or, is that the norm, these days. Been years since I've fiddled with duals.

Don't see why not. Years ago when subarus first came out with the
"lifetime" exhaust systems that eventually did rust out anyway, I would
run duals on them as the replacement parts at the time were out of the
world as far as price were concerned. 2 cylinders a side, some in front
of the rear wheels, sounded a little funky but the customers were
always happy. Did many V6's too, no problems.

Depends on what sensors the vehicle has. With ones that have pre and
post cat sensors you may run into a problem with no sensor on one pipe
after you split the exhausts. On units that don't have the sensors you
could just install dual cats and probably be OK.

--
Steve


"RB" > wrote in message
.. .
> On V-6s, is there any reason not to have duals on each side straight
on
> back, no crossover? It'd be a 3 / 3 split, one pipe off each
manifold.
> Or, is that the norm, these days. Been years since I've fiddled with
duals.
>
>
>



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RB wrote:

> On V-6s, is there any reason not to have duals on each side straight on
> back, no crossover? It'd be a 3 / 3 split, one pipe off each manifold.
> Or, is that the norm, these days. Been years since I've fiddled with duals.
>
>


I think any difference with/without a crossover on a v6 would be small
enough that it would be tough to measure. In theory, if you place a
crossover ahead of the mufflers then you'd still get a slight
improvement because even though the split on a v6 results in two
even-firing exhaust pipes (unlike a v8) the peak flow through each
muffler would be slightly reduced because the impulse from any given
cylinder on one bank falls at the minimum flow between two pulses on the
opposite bank, so SOME amount of flow-sharing can still occur. But its
not nearly as extreme as a v8 which has two uneven-firing exhaust pipes
if you don't connect them with a crossover.

Thanks, guys. Good answers and info. It's easier to put pipes straight
back than to bend and install a crossover, is the only reason I was asking
what I could get by with.

"RB" > wrote in message
.. .
> On V-6s, is there any reason not to have duals on each side straight on
> back, no crossover? It'd be a 3 / 3 split, one pipe off each manifold.
> Or, is that the norm, these days. Been years since I've fiddled with
> duals.
>
FWIW, I've seen/heard (and done several of my own) some sweet systems on
v-8 Chevy pickups where the muffler was removed, and a y-pipe installed
behind the cat and duals run from there out the rear. Actually, some
after-market tubing/muffler suppliers make a dual-pipe just for this
application. Sounded good on those engines w/o mufflers, kinda like quieter
glass-packs--and, to meet unforeseen future legal restrictions, it would be
simple to re-install the original muffler & tailpipe. Plus, it routs the
exhaust thru the factory cat-convertors (and thru the O2-sensors) so as to
meet that requirement.
Maybe such a system would sound/perform well on your v-6. s