ok, so i had a custom dual exhaust done on my car (not a true dual of course, but they cut off the stock 30 lb muffler and went to work from there. i figured since i'm not going to run a supercharger or turbo on the car, only N2O in the future, the stock pipes would be just fine) by velasquez & sons. they said it would be hard to run dual on my car (at least they didn't give me the answer exhaust works did, they said it's impossible to run a custom dual on my balt!), which is an '06 2.2L cobalt ls W/O SAI, so they lifted my car and we were looking at it and i had to tell them how to run the pipes. but they way they ended up running it seems to bother me.
i drew a crappy layout of what i'm talking about.

http://i561.photobucket.com/albums/s...AUSTLAYOUT.jpg

wouldn't the way they set it up interfere with the flow of the exhaust fumes. the reason i'm asking is because on idle the exhaust makes a sort of intermittent gurgling sound. like you hear the exhaust then you don't, you hear it, then you don't and it only stops when i turn on the A/C??? WTF did they do to my exhaust? should i take it back and have them rerun the pipes the way i suggested? or would my way not work?? are there any of you 2.2 peeps out there who've had a custom dual exhaust on your cobalts? i would love some suggestions!! i mean don't get me wrong the exhaust sounds like a beast otherwise, none of that ricey stuff lol, but it's this little thing that really bugs me. thanks in advance to those who help!!

 

Picture doesn't work.

 

sorry about that>>>> fixed

 

If the exhaust goes back on itself, like that I imagine the "second" exhaust is only getting mostly back pressure and might be screwing up your scavenging. I also would imagine it would make some crazy harmonics.

 

Your suggestion pretty much is a Y-Pipe, where it splits from single to dual.. What they did is some fucked up version of it, which I would imagine is hurting performance some how; it doesn't even look right..