Emissions compliance question

[VSTNG]

Stock '07 V6 config. is as follows: 2 headers, one each off of each side of the V6, followed by a catalytic converter on each side, then the two sides connect via a Y pipe, with a single pipe going all the way back to the single stock muffler. My question is about staying separate from headers to the 2 new mufflers or if there is a benefit to adding an x or h mid pipe between the stock catalytic converters and the 2 new Magnaflow mufflers?

[BurnTire]

Stock '07 V6 config. is as follows: 2 headers, one each off of each side of the V6, followed by a catalytic converter on each side, then the two sides connect via a Y pipe, with a single pipe going all the way back to the single stock muffler. My question is about staying separate from headers to the 2 new mufflers or if there is a benefit to adding an x or h mid pipe between the stock catalytic converters and the 2 new Magnaflow mufflers?

What is the shop planning to do in the quote you received?

This is from the flowmaster web site.

Will my late model vehicle run better if I replace the single inlet muffler with a true dual exhaust system?
Flowmaster does not recommend replacing factory single inlet exhaust systems with a "true dual" system on computer controlled vehicles. The computers in most late model vehicles will not be able to compensate with the fuel needed with an almost doubling of the exhaust flow. Flowmasters dual outlet kits will give you the look of a "true dual" system, while optimizing the vehicles performance.

Do I need to install an "H" pipe to my dual exhaust?
Flowmaster strongly recommends using an "H" pipe, commonly known as a "balance tube" on all "true dual" exhaust systems. An "H" pipe equalizes the pressures between both banks of the engine giving a broader and flatter torque curve throughout the rpm range. It also eliminates "back-rap" common on deceleration, and creates a deeper mellower tone both inside and outside of the vehicle.
Is an "X" pipe better than and "H" pipe?
Over the years, Flowmaster's testing of all types of crossovers, including "X pipes", has revealed no substantial benefits over a properly installed "H" pipe on street driven applications. However, in race applications with small cubic inch engines and /or restricted (small bore) carburetors, will respond well to the addition of X pipes, tri-y styled collectors and/or properly designed single exhaust systems.

[fazm]

Ill put my 2 cents in here. I have a 2005 mustang v6, which is heavily modded.

My first exhaust setup was the MRT muffler, which sounded like ass. I added JBA headers, which made it louder, but still sounded like ass.

I then decided to go a custom route, and do things myself. I located a used GT hpipe, and cut and welded it into my car. I cut my pipes right after the cats, and did the same with the gt pipe, and put it in there. Slight modification was required, as i was going from 2.25" pipe to 2.5" pippe. I then purchased OEM gt drivers side pipe, and hangers for the left side muffer. I then purchased the GT flowmaster american thunder system, and a gt rear bumper cover.

this setup sounds great in my opinion. It seems to perform just as well as the single setup.

my #s with the single were 212.5rwhp and 242rwtq
my #s with the duals were 211.7rwhp and 238rwtq but i also removed my alternator overdrive pulley which was good for 3-5rwhp and 4-6rwtq on the dyno.

my exhaust setup was not the cheapest, but i did it myself, so i saved labor charges.
$270 jba headers
$100 gt hpipe
$64 drivers side OEM midpipe
$40 exhaust hangers
$279 flowmaster exhaust.

$753 total. If youd like i can post a sound clip, but since you are local, you can just come down to my shop and you could listen to it in person

[BurnTire]

Dave will he need a tune it he gets rid of the y and goes true dual?

[fazm]

shouldnt need one, but definately could use one to tune it to make up for the loss of backpressure

[VSTNG]

fazm - what's the name and location of your shop?

[fazm]

fazm - what's the name and location of your shop?

pm sent