Dual in / Single out exhaust

[-cook-]

Hey there everyone, this is my first post here and I am looking at doing an exhaust upgrade. I just bought my first chevy (been a ford man until now :cool:) and it has the dual pipes into the muffler and single tailpipe. I was thinking of sticking with this setup but all my friends say I should just make it true duals.

I'm under the impression that the DI/SO will improve my bottom end but I don't know if it's exactly true. Is anyone out there running a setup like this? If so what muffler would you recommend? I looked at a magnaflow one but would enjoy reading some of your guys opinions.

I like true duals, and I thought of maybe throwing an xpipe on and runnin double pipes out the back. But I want something that will perform, not just to spend a bunch of money for noise and looks. Although a nice throaty rumble is pretty badass.

[liftedz71]

You will get alot of different opinions on this topic. The general consensus is a single exit style muffler either dual in or single will preform well for a generally stock motor. I recently put thorley headers, magnaflow cats, and a dual in single out magnaflow 18" muffler on my truck. Many will say the 18" is very quiet however i find this quite false. At idle this setup is tame. Lay into the throttle and it will open up well without being obnoxious. Cruise is just slightly louder than idle. I personally think duals are overrated for the simple fact that a single exit with the proper sized piping performs just as well IMO.

[5.7L JWL]

I"ll second what liftedz71 said. I have the Mag. DI/SO side exit (and the Y-Pipe and Cats unit) and am very happy with it. Ive had it for almost two years. I can tell you at times the drone in the cab is a bit annoying but like I said it's usually at a certain RPM climbing a hill or something. It doesn't sound (drone) like that all the time. I usually rate my MODS with IF I WERE TO DO IT AGAIN WOULD I GO THAT ROUTE and the answer is yes.

[chevy4x494]

i've got a 97 chevy that had the same setup your talking about...2 in single out. I cut the pipe off after the cats and put 2.25 pipe to a 2 chamber summit racing muffler then dumped it out before the rear axle. It's a true dual exhaust setup and i noticed an increase in HP. Now, I do believe that if you had a Y pipe with no cat and a single 3" pipe into some kind of performance muffler that you'll have a little better low end. The only real way to get that low end is with LT headers and other upgrades. Since you already have duals, i'd stick with that unless your made of money and don't care. I have two trucks, one as mentioned before and one with a single 2.5 exhaust...the duals have more HP. Do some searching, i've done the same thing your doing and theres a BUNCH of threads with this kind of stuff.