Originally Posted by PhilCommanderPayne
I'm about to upgrade my stock muffler to an 18" or 22" Magnaflow (that's a question in another thread! if anyone has any experience) and was wondering what the deal is with Y-pipes. I see that people use them to increase performance (slightly) and reduce unwanted noise but am confused as to where the are installed or if I can even use one on the commander.
I run the 5.7 Hemi and currently have the large stock muffler that is 1 in 1 out (and the resonator at the rear which I'll be keeping). Would the y pipe go just before my new muffler and split the inlet so I would then get a 2 in/ 1 out magnaflow instead of 1 in/ 1 out like I currently have or does the y pipe go somewhere different? I can't seem to find much info online about this. Will this help reduce potential drone? Does it have any other side effects?
Cheers for any advice..
Maybe you are talking about something I have not heard of before - because I surely have not seen it all.
But, taking two exhaust pipes and Y-piping it into a single exhaust pipe makes NO sense and wouldn't be beneficial on any level.
The only thing thing I have ever seen along the lines of what you are talking about is actually the opposite of what you are describing and takes a single exhaust pipe into a special muffler that has one intake pipe at the front of the muffler and two outlet/exhaust pipes coming out of the rear of the muffler to take an engine that has a single exhaust and give it two separate tail pipes and the APPEARANCE of dual exhaust, even though it is still not a true dual exhaust.
I had a muffler like that on a 79 Chevy Nova that I had when I was a kid with 305/V-8.
It looks cool and may improve exhaust flow ever-so slightly but all and all, I think the performance gains are very minimal.
And I don't know if they even make them for Commanders or not.
If there is a separate "Y Pipe" that performs the same function as the muffler I just described (and again, I have not seen one) I would assume it would be installed behind the muffler, converting a single tail pipe into 2 tail-pipes - again, to give the appearance of dual exhaust. That's the only thing that makes sense to me.
I think a better route would be a complete 3 inch Cat-Back exhaust system.
You'd probably gain more in both exhaust flow and performance with the larger diameter pipe from the catalytic converter all the way through the muffler and the tail pipe.